### Discussion :: Ratio and Proportion - General Questions (Q.No.11)

Green Violet said: (Jun 5, 2010) | |

Why is that the amount of % is written as 115 instead of 15 ? |

Manikandan S said: (Jun 19, 2010) | |

Why we have to use K there and how 15% is changed to 115? |

Anurag said: (Oct 11, 2010) | |

@Mankandan : We can also use x instead of k. 15% is changed to 115 it is a shortcut method to avoid long caluclation. |

Rama said: (Dec 9, 2010) | |

15% increase in salary = (100+15)% of 2k = (115/100)*2k. |

Sumya said: (Jan 27, 2011) | |

@rama is very much right as here salary is increase from 100 to 115. |

Rachana said: (May 25, 2011) | |

What is this k stands for ? |

Prabhu said: (Jun 16, 2011) | |

Here k denotes the common multiplication number in all the 3 given ratio. |

Boomadevi said: (Sep 15, 2011) | |

Why add this value 100+15? |

Preety said: (Oct 2, 2011) | |

We can do like 15% of 2= 15/100*2=3/10 total value=2+3/10=23/10 10% of 3= 10/100*3=3/10 total value=3+3/10=33/10 20% of 5= 20/100*5=1 total value=5+1=6 New proportion is 23/10:33/10:6 or 23:33:60 ans. |

Vijay Raja said: (Oct 15, 2011) | |

115 is taken because A'Value has increased by 15%. Now we can find new salary of A in two ways: 1st way: THEORY:Step 1: Calculating 15% in original salary ( i.e 2k) Step 2: And then adding it to the original value to get increased salary. Calculation:Step 1: (15/100)*2k= 3k/10 Step 2: (3k/10)+2k=23k/10 2nd way: THEORY: If we consider 100% is the original value. 15% is increased therefore 100%+15%=115% 115% of 2k gives 15% increased salary + original salary NOTE:here we need only one step to calculate new salary. CALCULATION: (115/100)*2k=23k/10 |

Radhika said: (Dec 21, 2011) | |

Preety shortcut is nice. |

Rupali Palande said: (Jun 21, 2012) | |

New ratio of their salaries, 115*2=230. 110*3=330. 120*5=600. i.e 230:330:600. i.e 23:33:60. |

Atul1487 said: (Apr 26, 2014) | |

Simplest way to understand. 15% increment in A Salary, So, 2*15% = 0.3. Total Salary of A after increment = 2+0.3 = 2.3. 10% increment in B Salary, So, 3*10% = 0.3. Total Salary of B after increment = 3+0.3 = 3.3. 20% Increment in C Salary, So, 5*20% = 1. Total Salary of C after increment = 5+1 = 6. Ratio of salary of A, B & C after increment. 2.3 : 3.3 : 6.0. So 23 : 33 : 60 Answer. |

Narayana Rao Gartam said: (Aug 18, 2014) | |

Let's salaries A,B,C are 200:300:500 i.e 2:3:5. A-increase of 15% is 200+30 = 230. B-increase of 10% is 300+33 = 330. C-increase of 20%b is 500+100 = 600. Ratio of A:B:C is 230: 330: 600. i.e 23: 33: 60. |

Asma said: (Nov 30, 2014) | |

A man will b three times old in 20 years as he is now. What is his present age? |

Narayana Rao Gartam said: (Feb 2, 2015) | |

Hai @Asma, Try below: Ans, is 10 years. Say, present age is = X, After 20 years man age will be 3X = X+20. i.e, 3X = X+20. 3X-X = 20. X = 10. Results, the man present age is 10 years. |

Agrima said: (Jun 2, 2015) | |

I still don't understand why we have written 115? |

Sourabh said: (Jul 18, 2015) | |

In this example mentioned 15% increase. That happened we are writing 115. In case here mentioned loss/decrease 15% in this case we are write 85. |

Abhinav Kumar said: (Oct 4, 2015) | |

Let common multiple be x: A = 15% of 2x+2x. = 15/100*2x+2x. = 3/10*x+2x. = 3x/10+2x = {3x+10(2x)}/10 = 23x/10. B = 10% of 3x+3x. = 10/100*3x+3x. = 3x/10+3x = {3x+10(3x)}/10 = 33x/10. C = 20% of 5x+5x. = 20/100*5x+5x. = 1x/5*5x+5x = 1x+5x = 6x. A:B:C = 23x/10:33x/10:6x. = 23x/10:33x/10:6x*10/10 (L.C.M). = 23x/10:33x/10: 60x/10. = 23:33:60 (10 and x gets cancelled). Hope I helped You guys! |

Hruaii said: (Apr 12, 2016) | |

Why you take 115/100 of 2k instead of 2k+15%? Please explain more in simplest form. |

Raju Kollati said: (Jul 18, 2016) | |

110/100 = 1.1. 1.1 * 3 = 3.3. |

Koushik Datta said: (Aug 30, 2016) | |

It can be solve in ay method: 2 * 115 : 3 * 11 : 5 * 120. = 2 * 23 : 3 * 22 : 5 * 24. = 23 : 33 : 60. |

Satham said: (Mar 3, 2017) | |

20*115/100 = 23, 30*110/100 = 33, 20*120/100 = 60. 23 : 33 : 60. |

Harshit Anand said: (Dec 9, 2017) | |

@Abhinav Kumar. Why the 10 and x gets cancelled in above question of Ratio and Proportion? |

Bindhu said: (Feb 16, 2018) | |

Can anyone tell me how you can solve 23k/10 : 33k/10 : 6x into 23k : 33k :6k? Please explain. |

Ramu said: (Mar 18, 2018) | |

2*1.15, 3*1.1,5*1.2. 2.3, 3.3, 6 23, 33, 60. |

Chandan Shil said: (Jul 14, 2018) | |

115*2/10=23, 110*3/10=33, 120*5/10=60. So, 23:33:60. |

Sardar Bahadar Khan Seehar said: (Aug 11, 2018) | |

How 23/10:33/10:6 = 23:33:60? |

Venu said: (Aug 29, 2018) | |

115/100*20:110/100*30:120/100*50. = 23:33:60. Here 2=20 and 3=30 and 5=50. |

Savi said: (Dec 5, 2018) | |

Thanks for the answer @Preety. |

Trimu said: (Dec 17, 2018) | |

@All. A:B:C 2:3:5. Increments are 15%, 10%, 20% Happen So we have to find out their new salaries, A= (2 * 0.15)=0.3 So add this in first ratio. Then 2+0.3=2.3 Similarly B = (3 * 0.1)=0.3, B = 3+0.3=3.3, C =( 5 * 0.2)=1, C = 5+1, So the Ratios are now 2.3 : 3.3 : 6, After multiplying with 100 in each; = 23:33:60. |

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