Question

the average age of 750 boys in a school is 15.4 years. 50 boys leave, there by dimnishing the average of the school to 15. 3 years. find the average age of those who left​

Answer 1

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⭐⭐Hello friend..Ur answer is here⤵⤵

⚫ 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

I HOPE IT IS HELPFUL TO YOU ☺

Answer 2

⚫ 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