Ratio and Proportion - Quantitative Aptitude (MCQ) questions for Q. 727

Q.   If the ratio of present ages of Jeet and Jay is 5:7 and after 6 years the ratio will be 3:4, what is the present age of Jay?
- Published on 06 Jul 15

a. 42
b. 30
c. 36
d. None of these

ANSWER: 42
 
As the present age of Jeet and Jay are in the ratio 5:7, let their ages be 5x and 7x respectively.
Therefore, their ages after 6 years will be (5x+6) and (7x+6) respectively.
Now, it is given that (5x+6)/(7x+6) = 3/4
4*(5x+6) = 3*(7x+6)
x = 6
Hence, the present age of Jay is 7x = 7*6 = 42 years

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