The average age of three boys is 15 yr. If the ratio of their ages is 3 : 5 : 7, What is the age of the oldest boy?

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Accepted Answer

Total age of all three boys = 3 x 15 = 45 yr Ratio of ages = 3 : 5 : 7 ∴ Age of the oldest boy = [7/(3 + 5 + 7)] x 45 = (7/15) x 45 = 21 yr

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