a) 12 years
b) 13 years
c) 14 years
d) 15 years
Answer: c
Explanation: Let son’s age 10 years ago be x years.
Then, man’s age 10 years ago = 7x years
Son’s present age = (x + 10) years,
Man’s present age = (7x + 10) years
$$\eqalign{
& {\text{2}}\left[ {\left( {7x + 10} \right) + 2} \right]{\text{ = 5}}\left[ {\left( {x + 10} \right) + 2} \right] \cr
& 2\left( {7x + 12} \right) = 5\left( {x + 12} \right) \cr
& 14x + 24 = 5x + 60 \cr
& 9x = 36 \cr
& x = 4 \cr} $$
Son’s present age = (x + 10) years
= (4 + 10) years
= 14 years
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