Aptitude - Ratio and Proportion - Discussion
Discussion Forum : Ratio and Proportion - General Questions (Q.No. 9)
9.
The sum of three numbers is 98. If the ratio of the first to second is 2 :3 and that of the second to the third is 5 : 8, then the second number is:
Answer: Option
Explanation:
Let the three parts be A, B, C. Then,
| A : B = 2 : 3 and B : C = 5 : 8 = |  |
5 x | 3 |  |
: | |
8 x | 3 | |
= 3 : | 24 |
| 5 | 5 | 5 |
 A : B : C = 2 : 3 : |
24 | = 10 : 15 : 24 |
| 5 |
| B = |
|
98 x | 15 | |
= 30. |
| 49 |
Discussion:
122 comments Page 2 of 13.
Kk kumar said:
3 years ago
I can't undersand, can anyone explain me?
(3)
Ashok said:
4 years ago
Simple way.
A:B:C.
2:3:
:5:8.
Add same value adjacent to blank space.
i.e,
2:3:3,
5:5:8 and multiply,
10:15:24.
Total Sum = 98.
Total sum of ratio=49.
Divide = 98/49=2.
Multiply 2 * 15 = 30 Ans.
Here, 15 is ratio of the 2nd number which is to be find.
A:B:C.
2:3:
:5:8.
Add same value adjacent to blank space.
i.e,
2:3:3,
5:5:8 and multiply,
10:15:24.
Total Sum = 98.
Total sum of ratio=49.
Divide = 98/49=2.
Multiply 2 * 15 = 30 Ans.
Here, 15 is ratio of the 2nd number which is to be find.
(28)
Nandita Bhoyar said:
4 years ago
We can try a simpler method:
Let the three numbers be x,y, and z.
It's given that,
x+y+z = 98 --------> (i)
Now, x/y = 2/3
So, x = 2y/3
And, y/z = 5/8
So, z = 8y/5.
Now putting the values of x and z in (i), we get
2y/3+y+8y/5 = 98,
(10y + 15y + 24y)/15 = 98,
49y/15 = 98,
49y = 1470,
y = 30.
Let the three numbers be x,y, and z.
It's given that,
x+y+z = 98 --------> (i)
Now, x/y = 2/3
So, x = 2y/3
And, y/z = 5/8
So, z = 8y/5.
Now putting the values of x and z in (i), we get
2y/3+y+8y/5 = 98,
(10y + 15y + 24y)/15 = 98,
49y/15 = 98,
49y = 1470,
y = 30.
(22)
Swetha said:
4 years ago
To get ratio as f:s:t we make s ratio equal in both multiply first ratio with 5 and second ratio with 3 then you will get 10:15 and 15:24 now we can write 10:15:24 and on adding them the result is 98 and we get x=2 and s=2(15)=30.
(3)
Ramesh said:
4 years ago
A : B : C.
2:3
---5: 8
2 * 5:3 * 5:3 * 8.
10:15:24
(15 * 98)/49 = 30.
2:3
---5: 8
2 * 5:3 * 5:3 * 8.
10:15:24
(15 * 98)/49 = 30.
(3)
Shafiya anjum. said:
4 years ago
Well explained, thanks @Alisha.
Sudip said:
5 years ago
1st : 2nd = 2:3
2nd : 3rd= 5:8
_____________________
1st:2nd:3rd = 2*5=10 : 3*5=15 : 3:8=24.
2nd number = 15/49*98,
= 30.
2nd : 3rd= 5:8
_____________________
1st:2nd:3rd = 2*5=10 : 3*5=15 : 3:8=24.
2nd number = 15/49*98,
= 30.
(2)
Niraj Hazarika said:
5 years ago
A/B = 2/3 and B/C = 5/8.
But B = 3 also,
So, 3/C = 5/8 => C=24/5.
But B = 3 also,
So, 3/C = 5/8 => C=24/5.
(2)
Kanchan said:
5 years ago
For making B in the ratio equal.
A:B =5*2:3*5
B:C = 3*5:8*3
A:B:C become,
10:15:24.
Now let multiple ratio by x.
10x:15x:24x.
As given;
10x + 15x + 24x = 98
49x = 98.
x = 2.
Now the second no.is 15x.
So, 15x2= 30.
Therefore the Correct answer is B.
A:B =5*2:3*5
B:C = 3*5:8*3
A:B:C become,
10:15:24.
Now let multiple ratio by x.
10x:15x:24x.
As given;
10x + 15x + 24x = 98
49x = 98.
x = 2.
Now the second no.is 15x.
So, 15x2= 30.
Therefore the Correct answer is B.
(3)
Nitika said:
5 years ago
a:b = 2:3,
C:d = 5:8,
a:b:c= 10:15:24.
And 10+15+24 = 49 but their total given is 98.
So, we will multiply 49 by 2(because. Their total is 98 not 49) which will be 98.
Now; as in question they have asked to find the second number. So we will now multiply 15 by 2 = 30 answer.
C:d = 5:8,
a:b:c= 10:15:24.
And 10+15+24 = 49 but their total given is 98.
So, we will multiply 49 by 2(because. Their total is 98 not 49) which will be 98.
Now; as in question they have asked to find the second number. So we will now multiply 15 by 2 = 30 answer.
(2)
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