three years ago, the average age of a, b and c was 27 years and that of b and c, 5 years ago was 20 years. aÂ’s present age is?
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3years ago
(a + b + c) /3 = 27
a + b + c = 27 * 3 = 81
current age of , b, and c = 81 + 9 = 90
5years before age of a, b, and c = 90 - 15 = 75
a + b + c = 75
a = 75 - 20 = 55
Present age of a = 55 + 5 = 60 years
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