The average age of M boys is ‘b’ years and of ‘n’ girls ‘ – McqOptions

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1.	The average age of M boys is ‘b’ years and of ‘n’ girls ‘c’ years. The average age of all together is?
A.	(mb – nc)/ (m + n) years
B.	(mb + nc)/ (m - n) years
C.	(mb + nc)/ (m + n) years
D.	(mb – nc)/ (m - n) years
Answer» D. (mb – nc)/ (m - n) years

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