### Discussion :: Ratio and Proportion - General Questions (Q.No.2)

Ganapathy said: (Jul 7, 2010) | |

Let third no be 100. the first no is 20% more than third so 120 similarly second no is 50% more than third so 150 just compare 120:150 4:5 |

Sheetal said: (Jul 29, 2010) | |

Suppose the 3rd no is X. so 1st no will be X*1.2. &2nd no will be X*1.5. so the ratio is 1.2:1.5, Hence 4:5 |

Ramesh said: (Dec 9, 2010) | |

120/100 : 150/100 120:150 12:15 4:5 |

Xyz said: (Jan 22, 2011) | |

20%=1/5 50%=1/2 So ratio should be equal to 1/5:1/2 Ans= 2:5 ? |

Ramesh said: (Feb 10, 2011) | |

Dear xyz, it is not 20% and 50%, but it is 20% and 50% MORE THAN third number. If third no is 100, it is 120 and 150 So, 120 : 150 12: 15 or 4:5 |

Sridhar said: (Feb 23, 2011) | |

Why should take the value of third no is 100 only? why not 60, 70, 80. |

Sathya said: (Feb 24, 2011) | |

Let 3rd no is x 20%of x=(20/100)*x 50%of x=(50/100)*x 1/5x:1/2x ans=2:5 |

Suganya.P said: (Jun 13, 2011) | |

I do know understand this concepts please explain. |

Sumit said: (Jun 24, 2011) | |

Let it be of 100. It is most convennience. |

Sathi said: (Jul 1, 2011) | |

Take A,B,C as three numbers A is 20% more than C A=C+20%of C=C+0.2C=1.2C same way B=C+50%of(C)=C+0.5C=1.5C ratio A/B=1.2C/1.5C=4/5 Ans 4/5 |

Sruthi said: (Jul 4, 2011) | |

Sathi's concept is right. |

Haseeb Siddiqi said: (Jul 11, 2011) | |

Ramesh's method is good and easy. |

Naveen said: (Jul 16, 2011) | |

Take 10 and 20% more than 10 is 12 and 50% more than 10 is 15 so the ratio is 12:15 which is nothing but 4:5 . |

Kunal said: (Sep 4, 2011) | |

Why take third number as 100? |

Priyabrata Muduli said: (Sep 18, 2011) | |

Sathi's concept is right. |

Manimekalai.V said: (Sep 22, 2011) | |

Ganapathy method is good. |

Abhishek said: (Oct 2, 2011) | |

I took x:x+20:x+50 then i assumed x+(x+20)+(x+50)=100 3x+70=100 x=10 hence the ration is 30/60 1/2 where did i go wrong? |

Sandeep said: (Oct 3, 2011) | |

Some one explain why it is 100? |

Kushi said: (Oct 13, 2011) | |

Thanks sathi. |

Ali said: (Nov 4, 2011) | |

Hey guys plz don't bother! let us make it simple... it was said that first number is 20% more than third number and second number is 50% more than third number.. now, we assume the third number is "x". we all know that "x" means "1x" not just "x" so 20% more and 50% more than third number means (20%)+(1x) and (50%)+(1x) =(0.2)+(1x) and (0.5)+(1x) =1.2x and 1.5x now 1.2 : 1.5 let us forget the decimal and assume it 12 : 15 now simplify 12 : 15 i.e divide it by 3. you'll get 4:5 that's it.... |

Nidhi said: (Nov 12, 2011) | |

Ganapathy you are awsome. |

Richa said: (Nov 26, 2011) | |

Sathi method is very good. |

Gnaneswar said: (Jan 3, 2012) | |

Sathi concept is perfect. |

Enigma said: (Jan 8, 2012) | |

How can one add a costant n a variable? dats wrong..! its simply.. x=20/100*z+z y=50/100*z +z if z is taken as the third no.. :) |

Sasa said: (Jan 13, 2012) | |

Ali and ganapathy good work :). |

Gitty said: (Feb 1, 2012) | |

If you take x as 100 we will get 4:5..agreed. What is the problem in taking x as a variable itself..? Then the answer become 2:5,right..? could anyone please explain ? |

Satish Rathnam said: (Feb 10, 2012) | |

ok mr.gitty take 'x' only. u will get 4:5 =>1st number :2nd number => 20% more than X : 50% more than X => now cancel "more than X" on both sides => 20% : 50 % => 1.2 : 1.5 => 4:5 |

Prashant said: (Feb 21, 2012) | |

20% of 'x' + 'x' (20% more than third number) => 120/100x |

Yash said: (Jun 23, 2012) | |

I understand the method but why we add 100 in 20% and 50%. If we take third no is x so how a variable is added in 20% and 50%. But satish your method is simple and understood to me. |

Bharadwaj said: (Aug 21, 2012) | |

Sathish ratnam was explained very well. |

Neethukasi said: (Sep 18, 2012) | |

Ya ramesh's method is more easy. |

Sajal Das said: (Oct 15, 2012) | |

Let the 2 Nos are A and B and the 3rd No. is C. According to the question A is 20% more than C. i.e., A=(1.2)C and B is 50% more than C. i.e., B=(1.5)C. And so the ratio is {(1.2)C}/{(1.5)C} = 4/5 , i.e., 4:5. |

Ramaniah said: (Nov 26, 2012) | |

Let us know the number is x. Then 1st number is 1.2x. Then the 2nd number is 1.5x. The the ratio of two numbers are 1.2x:15x=> 1.2 :1.5 =>4:5. |

Hussain Ali said: (Jul 13, 2013) | |

Let A, B, C are three numbers. A is 20% more than C. So A become: A= C+20%of C = C+0.2C = 1.2C. B become: B= C+50%of(C)= C+0.5C = 1.5C. And ratio between A/B is: 1.2C/1.5C = 4/5. Hence answer is:4/5. |

Hassan said: (Jul 18, 2013) | |

Suppose a number, 100____120. 100 ___150. Hence the numbers are increasing by 20 and 50% 120 : 150. 12 : 15. 4 : 5. |

Nive said: (Aug 9, 2013) | |

We know there are 3 numbers. Think., 1st one X. 2nd one Y. 3rd one Z. Then assume that Z's value a. Now X=a+20%. Y=a+50%. Put a=10. Now we get X=12; Y=15. So the ratio of X and Y is 4:5. |

Nishant Raj said: (Sep 18, 2013) | |

Very simple method is: Let assume that 3th number is = 100. Then, a/c to ques. A = 120. B = 150. Ratio of number A/B = 120/150. = 4/5. A:B = 4:5 (ANS. C). |

Naman said: (Nov 4, 2013) | |

Ratio is 1.2 : 1.5 : 1. = 12 : 15 : 10. = 4 : 5 : 1. Hence 4 : 5. |

Gok said: (Nov 28, 2013) | |

Please clearly say why you added 100 in 20% and 50%? |

Giri said: (Jan 7, 2014) | |

Let x be 3rd number then, 1st number is 20% greater than 3rd number,so 1st number is equal to x+(x*(20/100)). x(1+(20/100)). x((100+20)/100). x*(120/100). That why we will add 100 to given percentage to find increase in it. |

Mayank Mathur said: (Jan 18, 2014) | |

Given % is 20 & 50. Let the 3rd no is 100. Then for A = 20% more means number is 120. Similarly for B number is 150. Ratio 120: 150. 12:15. 4:5 (divide by 3 to both number ). |

Gaurav said: (Mar 30, 2014) | |

Confused guys. Please read the question carefully. Its first and 2nd number is 20% and 50 % more than the third number. Obviously that means that the third number should be 100% or you can take it as 100. |

Narayana Rao Gartam said: (Aug 7, 2014) | |

Consider third number as 100, to do easy and better calculations. |

Samira said: (Aug 9, 2014) | |

Hey @Satish how you get 1.2 & 1.5 ? |

Hemant said: (Sep 6, 2014) | |

100+20:100+50 = 120:150 = 4:5. |

Kavinraj said: (Sep 8, 2014) | |

Hi. my explanation is, assume your 3rd num is 10, 20%of 10=2 so 1st no is 12. 50%of 10=5, so 2nd no is 15. So ratio of 12:15 = 4:5. |

Svs said: (Oct 27, 2014) | |

Hi, I really confuse. Please clear my doubt. Which is correct answer? Please tell. @Sathya said 2:5. Anyone tell correct answer? |

Akshay said: (Oct 28, 2014) | |

@Nive. Method is actually according to the question approach. Its is valid. a = c+20%. b = c+50%. a/b = 100c+20/100c+50. Now c definitely having some value so consider it as 1 we can't consider it as 0 because it has some value and on other hand we have to consider it as 1 because it has some non zero value. So a/b = 0.8 i.e. 4/5. |

Rosh said: (Jan 16, 2015) | |

Let 3rd no be x then. (x+120/100):(x+150/100). Take LCM 100 gets cancelled. 100x+120 = 100x+150. We get 120 = 150. So 4 : 5. |

Abhinav said: (Feb 11, 2015) | |

Let number = x, y, z. Then, x = 20% of z + z = 6z/5. y = 50% of z + z = 3z/2. Ratio is x/y = 4/5. |

B.Lingaswamyyadav said: (Mar 7, 2015) | |

Let the third number will taken as 100. = 120/100 = 150/100 = 12 = 15. = 4 = 5. |

Niz said: (Apr 1, 2015) | |

If a, b, c. a = c + 20% of c. i.e a = c + 20/100*c. a = c + 0.2 c. i.e 1.2 c. Also b = c + 50% of c. i.e b = c + 50/100*c b = c + 0.5 c. i.e 1.5 c. Ratio between three numbers. = 1.2 c : 1.5 c : c. = 1.2 : 1.5. i.e 4 : 5. |

Jaity said: (Apr 30, 2015) | |

But why did we took 120% instead of 20% and 150% in place of 50%? |

Anish Sharma said: (May 18, 2015) | |

Listen 20% more than third no and 50% more than through number. So, First-> solve the 20% = 20/100 = 0.2. But 20% more than third no, so we will add a third no. And assume the third no. is x and x mean (1x) not a simple x. So 0.2+1x = 1.2. Second-> same for 50% = 50/100 = 0.5. 0.5+1x = 1.5. = 1.2:1.5. = 12:15. So you can say: 4:5. |

Santosh said: (May 31, 2015) | |

Somebody let me know What is the ratio and what is the implementation of this? |

Parikshit said: (Jun 30, 2015) | |

Question says that two numbers are 20% and 50% MORE THAN third no then it should be like this: No third no = X. No A = 120*X/100+X. B = 150*X/100+X. But it gives 22:25. |

Usha said: (Aug 14, 2015) | |

Hey anyone can explain what is meaning by third number and how its became 20% to convert 120 and 150 please explain guys. |

Vamshi said: (Sep 11, 2015) | |

Let the third number be x = 100. The first number is 20% more than third number so 100+20% = 120. The second number is 50% more than third number so 100+50% = 150. = 120:150 = 4:5. |

Manas said: (Oct 3, 2015) | |

Out of three number, the first number and the second number are respectively 25% and 30% less then the third number. By what percentage is the second number less then the first? Can any one solve the problem? Then please. |

Chex said: (Oct 9, 2015) | |

Let x be the third value, hence. 20% of x = x+(20/100*x) = x+(x/5) = 6x/5. 50% of x = x+(50/100*x) = x+(x/2) = 3x/2. Now ration is, (6x/5)/(3x/2) = 12x/15x = 4/5. |

Lokesh Anand said: (Oct 21, 2015) | |

Let third number is 100. Than 20% of third = 20 & 50% of third 50. Than first number = 120(100+20). Then second number = 150(100+50). By question, Ratio of two number = First number:Second number. = 120:150 = 4:5. |

Ramanan said: (Nov 14, 2015) | |

Let the third number be x given that: x+20% : x+50%. x+0.2 : x+0.5. (we know x is '1x'). So, 1x+0.2 : 1x+0.5. = 1.2x : 1.5x. (To remove decimal points we are multiply in both sides by 10). = 1.2x*10 : 1.5x*10. = 12x : 15x. By simplifying, = 4 : 5. (x will get cancelled when 12x/15x). |

Harshitta said: (Feb 13, 2016) | |

How to calculate to 1.2 and 1.15? How to get answer 4 = 5? I can't understand. |

Shafai Rizvi said: (May 7, 2016) | |

@Harshitta. It is 1.2 and 1.5 (not 1.15). So now simplify it, = 1.2/1.5 (points cancel out). = 12/15 (cancel out by 3). = 4/5. |

Maha said: (Jun 5, 2016) | |

Lets us take c value as 100 then a value is 20% more. So, c becomes 120 Similarly, b becomes 150 then, 120 : 150 becomes 4:5. |

Sameer Khan said: (Jul 18, 2016) | |

Ganapathy and Ramesh concept are easy and right. |

Manish Kumar said: (Jul 26, 2016) | |

What to do, if asked for third number? |

Dibya said: (Aug 1, 2016) | |

Sathi concept is good. |

Manishanaveen said: (Aug 23, 2016) | |

The third number be x. Let a and b are two numbers with more than 20% and 50% of x. a = x + 20%x. b = x + 50%x. We should find ratio a : b. a/b = (x + 20%x)/(x + 50%x) we know % converted into (/100), a/b = (x + 20x/100)/(x + 50x/100), so we get a/b = (100x + 20X/100x + 50x). a/b = (120x/150x) a/b = 4/5. Ratio of a = 4 and b = 5. Shortcut: So just us 100 as x for removing % a =100 + 20. b =100 + 50. a : b = 120 : 150. And hence a/b = 12/15. a/b = 4 : 5 |

Rakesh said: (Sep 7, 2016) | |

@Ganapathy concept is very nice. |

Anjaney said: (Sep 8, 2016) | |

@Kunal. It is 100 because ratio should be treated as 100. |

Shahjahan said: (Oct 1, 2016) | |

How you get 120 and 150? Confused. Please help me. |

Cik_Nani said: (Oct 7, 2016) | |

How do you get 120/100? And how do you get the answer 6 over 5? I'm confused. Please clarify me. |

Abinash said: (Oct 20, 2016) | |

If a and b incomes are in the ratio 9:4. Their expenditure are 8:3. Each saves rs 2500. Then expenditure of b? Please tell me the answer for this. |

Rashid Ali said: (Nov 28, 2016) | |

The correct answer is 2:5. I'm explaining bellow 20% means X is multiplied with 100. For example : 95% of 80 = 80 * 95/100 = 76. If you are agree with this concept then, 20% = 20/100 and 50/100. 20% = 1/5 and 50% = 1/2 A 1/5 : B 1/2 =2 : 5. Hence answer is 2 : 5. |

Rajini said: (Dec 22, 2016) | |

Your concepts is good @Ganapathy and @Ramesh. |

Alexa said: (Jan 13, 2017) | |

% always means 100 so we 1st take 100 as the cmplt no. |

Changaganjeet Singh said: (Mar 4, 2017) | |

Your method is easy. Thanks @Ramesh. |

Chan Gaganjeet Singh said: (Mar 4, 2017) | |

Let the third no. Be = 100. Then add 100 in 20% and 50%. It will be 120 and 150. =120 : 150, = 12 : 15, = 4 : 5. |

Shah Saain said: (Mar 18, 2017) | |

@Ali. Good and clear method. Thanks. |

Aayusha said: (Apr 20, 2017) | |

I understand now, thank @Satish Rathnam. |

Juke said: (Apr 22, 2017) | |

Here is my solution. Let, x be the first num. y be the 2nd. z be the 3rd. x is larger than z by 20% so, x=1.2z : z=x/1.2. y is larger than z by 50% so. y = 1.5z : z = y/1.5. Equate z, x/1.2 = y/1.5. x/y = 1.2/1.5. x/y = 4/5. 4:5. |

Valar Morghulis said: (Jul 19, 2017) | |

I have a doubt that most people are facing here it seems: It's written 20% more than the third number so we took Z(third number) + (20/100)*Z. What should be written if the equation comes as Z + 20/100? Please, someone, take a time to help me and clarify this. Thank you. |

Ravi said: (Aug 18, 2017) | |

Simply, we all know that in Case Of percent 100 % is max percentage. So take 3rd number be 100% A say more than 3rd no. That is 20%+100%=120% or 1.2 B say more than 3rd no. That is 50%+100%=150% or 1.5 Now, divide A/B=1.2/1.5=4:5. |

Aafaque Ali said: (Nov 17, 2017) | |

Percent = cent means 100 okey then. 20% n 50% just add them a 100. 120 n 150. 120 : 150 simplify. 4:5 Answer simple way. |

Bdyachan said: (Dec 27, 2017) | |

Let 3rd no. X. 20% of X =x/5, So required no= X+x/5 =6x/5 (due to 20%more), and 50% 0f X=x/2 , so required no =X+x/2=3x/2 (due to 50% more), Now ratio =6x/5*2/3x=4:5 (ans 0). |

Limsss said: (Sep 16, 2018) | |

Thanks all for explaining this. |

Azan said: (Oct 15, 2018) | |

How come 120 and 150? |

Riddhi said: (Nov 9, 2018) | |

Why you take 100 here? Please explain me. |

Sayani said: (Dec 14, 2018) | |

We can assume the third number as 100. |

Trimu said: (Dec 17, 2018) | |

Let, The 3rd number be 100. Then the 1st number is more than 20% than the 3rd number so 100+20=120. Similarly, 2nd number is 100+50= 150. Now the ratio of two numbers, 120:150, 4:5. |

Anomie said: (Feb 2, 2019) | |

@All who have a doubt that why does 100 only comes in place of x. It is so because percentage is always 100. Therefore x = 100. |

Sushant Pal said: (Mar 29, 2019) | |

a : b: 20%:50% 20/100 = 2/5 50/100 = 1/2 a:b :: c:d. 2:5 :: 1:2. = answer 5:4 or 5/4. |

Bindu D K said: (Jul 13, 2019) | |

20%= 120. 50% = 150. 120:150 = 120/150 = 4:5. |

Sindhu said: (Jul 18, 2019) | |

Let the third number be 100. Then 20% of 100 is 20, And 50% of 100 is 50, Then the 1st number is 120, The 2nd number is 150, So, the ratio between 120 and 150 is 4:5. Thanks. |

Aabir said: (Feb 5, 2020) | |

I could not understand it. Please explain it. |

Prashant said: (May 15, 2020) | |

Why we convert this 20% to 120%? |

Arya said: (Jun 12, 2020) | |

How you get to know that third number is 100? Please explain. |

Ugyen Dema said: (Jul 21, 2020) | |

I am getting 2:5. Please anyone explain the answer clearly. |

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