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William Wu
Answers (1)
Well, because there are 4 lb of cement for 1 lb of gravel, the ratio would be 4:1 for cement and gravel, respectively. Each of the items added together would be 5 pounds, but 1 of each 5 pounds is gravel, so 1/5 of the mixture is gravel. 1/5 * 215 = 43
