On national lipstick day, half of the students who attended class wore colored lipstick. Of those students who wore lipstick, one quarter wore red lipstick. There were one-fifth as many students wearing blue lipstick as were wearing red lipstick. If 200 students attended school that day, how many wore blue lipstick? Think carefully first, then make a decision:
Of 200 students who attended class, half wore colored lipstick, or 200 / 2 = 100 students wore colored lipstick. Of those students who wore lipstick, one quarter wore red lipstick, or 100 / 4 = 25 students wore red lipstick. Since there were one - fifth as many students wearing blue lipstick as were wearing red lipstick, then 25 / 5 = 5 students wore blue lipstick. So, the answer is 5.