The average age of three boys is 15 yr. If their ages are in the ratio – McqOptions

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1.	The average age of three boys is 15 yr. If their ages are in the ratio of 3 : 5 : 7, then the age of the youngest boy (in yr.) is :
A.	18
B.	21
C.	9
D.	15
Answer» D. 15

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