Q. 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
No explanation is available for this question!