The mean age of a combined group of men and women is 30 years. If the means of the age of men and women are respectively 32 and 27, then the percentage of women in the group is
The correct option is D 40
The formula for combined mean is
Let n1+n2=100 and n1 donates men, n2 denotes women for this n2=100−n1
Hence, the percentage of women in the group is 40.