Answer:
u=5.23
Step-by-step explanation:
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Let x be the amount of cement and y be the amount of sand. If <span>the ratio of cement to sand for mortar is 1:3, then 
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So, if <span>Sandy puts in x=7 shovels of cement, then she puts
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</span><span>Answer: 21 shovels of sand.
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So, if <span>Sandy puts in x=7 shovels of cement, then she puts
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</span><span>Answer: 21 shovels of sand.
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