The average age of three persons is 27 years. Their ages are in the proportion…
2023
The average age of three persons is 27 years. Their ages are in the proportion of 1:3:5.What is the age in years of the youngest one among them.
Answer: D. 9 — Key idea: Let the ages be x, 3x and 5x. Total of ages = average × number of persons = 27 × 3 = 81. Sum of ratio parts = 1 + 3 + 5 = 9, so each part = 81 ÷ 9 =…
- A.
10
- B.
12
- C.
11
- D.
9
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Correct answer: D
Key idea: Let the ages be x, 3x and 5x.
Total of ages = average × number of persons = 27 × 3 = 81.
Sum of ratio parts = 1 + 3 + 5 = 9, so each part = 81 ÷ 9 = 9.
Youngest = 1 part = 9 years.
Answer: 9 years.
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