Average age of 3 boys is 15.if their age are in ratio 3:5:7.what is the age of young boy?
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Sum of ages of three boys = 45 years
Now, (3x+5x+7x) = 45
Or, 15x = 45
Or, x = 3
So, age of youngest boy = 3x = 3*3 = 9 years.
Now, (3x+5x+7x) = 45
Or, 15x = 45
Or, x = 3
So, age of youngest boy = 3x = 3*3 = 9 years.
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