Cindi bought 30/0.50 = <<30/0.50=60>>60 pencils.

Marcia bought 2*60 = <<2*60=120>>120 pencils.

Donna bought 3*120 = <<3*120=360>>360 pencils.

Altogether, Donna and Marcia bought 120+360 = <<120+360=480>>480 pencils.

# Answer

480
<|im_start|>system
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<|im_start|>user
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?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
480
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?
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