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sergiy2304 [10]
3 years ago
14

Help pleasee

Mathematics
2 answers:
riadik2000 [5.3K]3 years ago
8 0
Set this up as a proportion with cement on top and sand on bottom.  Our proportions will look like this then: \frac{1}{3} = \frac{7}{x}.  Cross multiply to get x = 21.  So 21 shovels of sand is needed.
Mnenie [13.5K]3 years ago
6 0
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 \frac{x}{y} = \frac{1}{3} and y=3x.
</span>
So, if <span>Sandy puts in x=7 shovels of cement, then she puts y=3\cdot 7=21 shovels of sand.
</span><span>
</span><span>Answer: 21 shovels of sand.
</span>
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