My question is: Donna bought 3 times as many pencils as Marcia did. Marcia bought double the number of pencils as Cindi did. How many pencils did Donna and Marcia buy altogether if Cindi spent $30 on $0.50 pencils? Your thoughts:
Cindi bought 30 / 0.50 = 60 pencils. Marcia bought 2 * 60 = 120 pencils. Donna bought 3 * 120 = 360 pencils. Altogether, Donna and Marcia bought 120 + 360 = 480 pencils. The final answer: 480.