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If a certain concrete mixture contains gravel, water, and sand in a 1 to 3 to 5 ratio by weight, how many pounds of gravel would be needed to produce 72 pounds of the mixture?
A. 72
B. 40
C. 24
D. 9
E. 8
The OA is E
Source: Princeton Review
A. 72
B. 40
C. 24
D. 9
E. 8
The OA is E
Source: Princeton Review
