Question
The ratio of present age of A to that of B is 6:5 and
the ratio of present age of A to that of C is 6:8. The average present age of A, B and C is 19 years. Find the age of B, after 5 years.Solution
The ratio of present age of A, B and C = 6 : 5 : 8 (6x, 5x, 8x)  The average present age of A, B and C = 19 years => (6x + 5x + 8x)/3 = 19 => 19x = 57 => x = 3 The age of B, after 5 years = 5 × 3 + 5 = 20 years
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