RRB Group D 17-Sep-2018 Shift 1 Solved Paper

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Question : 53 of 100

Marks: +1, -0

The ratio of the present ages of

{X}

and

{Y}

is 3: 4 . Five years ago, the ratio of their ages was 5: 7 . What is the present age of Y?

40 years
30 years
60 years
50 years

Solution:

\;{X}/{Y}=\;{3}/{4} ⇒ X=\;{3 Y}/{4}

also

\;{X-5}/{Y-5}=\;{5}/{7} ⇒ 7 X-5 Y=10

(i) and (ii) we have from

7(\;{3 Y}/{4})-5 Y=10

21 Y-20 Y=40 ⇒ Y=40

years.

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