Description for Correct answer:
Total age of father and mother = 35 x 2 = 70 yr
and total age of father, mother and son
= > 27 x 3 = 81 yr
Age of son = 81 - 70 = 11 yr

Let the present age of Varun be x and present age of Kapil be y.

According to the questions,
x+ y = 42 ... (1)

From the question, After, 5 yr, \( \large\frac{x + 5}{y + 5} = \frac{15}{11} \)
= >11x +55 = 15y + 75

= > 11x - 15y = 20 .... (2)
On solving equation (1) and (2),

11x + 11y = 462

Y = \( \large\frac{442}{26} \)

Hence, present age of Kapil = 17 yr