Question
The ratio of A and B present age is 7:3. The product of
their ages is 8400. What will be the ratio of their ages after 4 years?Solution
Let their present age be 7x and 3x respectively. Product of their ages = 21x² = 8400 => x² = 400 => x = 20 Present age of A = 7x = 140 years Present age of B = 3x = 60 years Ratio of their ages after 4 years = (140+4) : (60+4) = 144:64 = 9:4
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