Present ages of ‘A’, ‘B’ and ‘C’ are in the ratio 4:7:12, respectively. If present average age of ‘A’ and ‘C’ is 32 years, then find the age of ‘B’ when ‘C’ was 30 years old?
Let the present ages of ‘A’, ‘B’ and ‘C’ be ‘4x’ years, ‘7x’ years and ‘12x’ years, respectively. ATQ; (12x + 4x) ÷ 2 = 32 Or, 16x = 64 So, x = 4 So, present age of ‘C’ = 12 × 4 = 48 years Present age of ‘B’ = 7 × 4 = 28 years Difference between the ages of ‘B’ and ‘C’ = 48 – 28 = 20 years So, age of ‘B’ when ‘C’ was 30 years old = 30 – 20 = 10 years
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