RRB RPF RPSF SI and CONS Model Papers 6 with solutions

Question : 15 of 120

Marks: +1, -0

The average age of a man and his son is 30 years. Four years ago, the ratio of their ages was 10 : 3. What is the difference between the present ages of the man and his son?

28 years
16 years
26 years
44 years

Validate

Solution:

(1) Let the present ages of man and son be M and S, respectively.
According to the question,

{(M+S)}/{2}=30

⇒M + S = 60 .....(1)
Also,

{M-4}/{S-4}= {10}/{3}

⇒10S – 3M = 28 ......(2)
On solving (1) and (2), we get
S = 16 and M = 44
Therefore, M – S = 28 years.

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