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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 ,A. 60 , 40B. 80 , 20C. 20 , 80D. 30 , 70 |
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Answer» Correct Answer - B `25 = (26 x_(1) + 21x_(2))/( x_(1) + x_(2))` `x_(1) = 4x_(2) therefore x_(1) = 80% , x_(2) = 20%` |
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