Dana and sandbox

Dana helped her dad build a sandbox for her younger sister. The sandbox is shaped like a rectangular prism, 4 1/2 feet long and 4 feet wide. Dana used bags of sand to fill the sandbox 1/2 of a foot deep. Each bag contained 1/2 of a cubic foot of sand. How many bags must she buy?

Correct answer:

n =  18

Step-by-step explanation:

a=421=4+21=24 2+1=28+1=29=421=4.5 ft b=4 ft c=21=0.5 ft V1=21=0.5 ft3  V=a b c=29 4 21=9 ft3  n1=V/V1=9/21=9:21=9 12=19 2=118=18  n=n1=18=18

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Math student
its 18

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