The ratio of ages of the father and mother was 11 ∶ 10 when their son was born. The ratio of ages of the father and mother will be 19 ∶ 18… — Answer & Discussion

The ratio of ages of the father and mother was 11 ∶ 10 when their son was born. The ratio of ages of the father and mother will be 19 ∶ 18 when the son will be twice his present age. What is the ratio of present ages of father and mother?

A15 ∶ 14
B14 ∶ 13
C16 ∶ 15
D17 ∶ 16

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Discussion 1

CCommunity25 May 2019

Ratio of ages of the father and mother when their son was born = 11 ? 10

Ratio of ages of the father and mother when son will be twice the present age = 19 ? 18

Here we can see that difference in the ratios is equal for father and mother (19 - 11 = 18 - 10 = 8)

Since the age of son has been doubled so we may subtract 4 (8 ÷ 2) in the ratio for getting present ratio.

⇒ 19 - 4 = 15 and 18 - 4 = 14

∴ Ratio of present ages of father and mother = 15 ? 14