Question 269708
The given info tells you there are 21 employees and 1/3 are men. 
{{{21 * (1/3) = 7}}} so there are 7 men. Thus there are 14 women

You are asked to find out ho wmany women to hire such that men wind up being 1/4 of the total

The number of men won't change. 

{{{7 * 4 = 28}}} We need to get a total of 28 employees.
Since there are 21 now, and we need 28, hire 7 women.

Answer A