The average age of three persons is 40 years and their ages are in proportion 3 : 4 : 8. What is the age in years of the youngest person?

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Answer & Explanation

Correct AnswerB. 24

Quick Explanation

Total age = 3 × 40 = 120. Ratio sum = 3+4+8 = 15, so youngest age = 120 × 3/15 = 24.

Share = total × ratio part / ratio sum

Total age = 3 × 40 = 120. Ratio sum = 3+4+8 = 15, so youngest age = 120 × 3/15 = 24.

Use the standard formula directly after identifying the quantities.

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