Erin put 16 curlers in her hair. One-fourth of the curlers are small pink ones. There are twice as many medium blue curlers as there are pink ones. The rest are large green curlers. How many large green curlers does Erin have in her hair? Let's answer step by step:
There are 16 curlers in all and of them are pink or 16 curlers / 4 = 4 pink curlers. There are twice as many blue curlers as there are pink ones, so there are 4 pink x 2 = 8 blue curlers. Together, there are 4 pink curlers + 8 blue curlers = 12 pink and blue curlers in Erin's hair. The remaining curlers are green, so of the 16 total curlers 12 pink and blue curlers = 4 green curlers are in Erin's hair. The answer: 4.