The mean age of a combined group of men and women is 25 yrs . If mean age of men is 26 and that of women is 21 , then percentage of men and women in the group , is ,

Options

A. 20, 80
B. 40, 60
C. 60, 40
D. 80, 20

Answer

D

Explanation

`"Let No. of Man"=M`
`"Let No. of Women"=W`
`26M+21W=25(M+W)`
`M=4W`
`M:W=4:1`
`therefore" Percent of Men and Women"=80%,20%`