The average age of three boys is 15 yr. If the ratio of their ages is 3 : 5 : 7, What is the age of the oldest boy ?

The average age of three boys is 15 yr. If the ratio of their ages is

1.	The average age of three boys is 15 yr. If the ratio of their ages is 3 : 5 : 7, What is the age of the oldest boy ?
A.	7 yr
B.	14 yr
C.	20 yr
D.	21 yr
E.	None of the above
Answer» E. None of the above

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The average age of three boys is 15 yr. If the ratio of their ages is 3 : 5 : 7, What is the age of the oldest boy ?

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