At a party of thirty-five people there are twice as many women as children and twice as many children as men. How many of each are there?
20 women, 10 children and 5 men.
To figure it out, let m be the number of men and you get this equation:
4m + 2m + m = 35
7m = 35
m = 35 ÷ 7
m = 5