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OpenStudy (anonymous):
Concrete is a mixture of cement, sand, and gravel. The Masons will purchase a cement, sand, and gravel mixture in a ratio of 1:2:3. How many pounds of each material are needed for 60 lb of concrete mix
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OpenStudy (sparrow2):
x+2x+3x=60 x=10 cement 10 sand 20,gravel 30
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