Cole is studying employment trends. He found that 20% of the social workers he surveyed, or 45 social workers, work part time. How many social workers did Cole survey altogether?
So we know that 20% of the social workers he surveyed was 45 people. The easiest way to find all 100% of the social workers is to do 45 x 5 because 20% x 5 = 100%. So 45 x 5 = 225.
