Question
Ratio of present age of a father to that of his son is
9:2. After 4 years the ratio will become 4:1. What is the difference (in years) in their present ages?Solution
Let present age of father and his son be ‘9x’ years and ‘2x’ years, respectively. ATQ; (9x + 4)/(2x + 4) = 4/1 Or, 9x + 4 = 8x + 16 Or, x = 12 Desired difference = 9x – 2x = 7x = 7 × 12 = 84 years
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