The ratio of the present ages of father and his son is 7:5. The product of their ages 3 years ago was 32 times of his son’s age that year. What was son’s age 4 year ago?
Let present age of father and son be 7x and 5x respectively. According to question, => (7x – 3) (5x – 3) = 32 × (5x – 3) => (7x – 3) = 32 => 7x = 35 => x = 5 Therefore, son’s age 4 years ago = (5x – 4) = 21 years
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