Question

the average age of three boys is 15 years if their age are in ratio of 3:5:7, the age of the youngest boy is​

Answer 1

Answer:

Explanation:

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⚫ 3:5:7

Let the ages of boys are 3x,5x and 7x

➡Average=3x+5x+7x/3=15

➡ 15x/3=15

➡ 5x=15

➡ x=3

So the age of youngest boy is 3x=3×3=9 year