# Ratio and Proportion - Quantitative Aptitude (MCQ) questions for Q. 28168

Q.  285 is summation of 3 numbers. Ratio between 2nd and 3rd numbers is 6:5. Ratio between 1st and 2nd numbers is 3:7. The 3rd number is?
- Published on 07 Jul 17

a. 135
b. 150
c. 124
d. 105

ANSWER: 105

Values of 2nd number = 7 and 6 (They are not the same)

Make the values of 2nd number same as follows -

Multiply 3:7 up and down with 6 as shown

Multiply 6:5 up and down with 7 as shown

Values of 2nd number are now same = 42

1st number : 2nd number = 18 : 42

2nd number : 3rd number = 42 : 35

1st number : 2nd number : 3rd number = 18 : 42 : 35

Common factor helps in finding actual values easily

So, take ‘A’ as common factor.

So now the 3 numbers are 18A, 42A and 35A

18A + 42A + 35A = 285

A = 3

3rd number = 35A = 35 x 3 = 105

#### Discussion

• Sunny   -Posted on 18 Oct 17
Awesome ser, you are brilliant

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