Help pleasee

2 answers:

riadik2000 [5.3K]4 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]4 years ago

6 0

Let x be the amount of cement and y be the amount of sand. If the ratio of cement to sand for mortar is 1:3, then $\frac{x}{y} = \frac{1}{3}$ and y=3x.

So, if Sandy puts in x=7 shovels of cement, then she puts $y=3\cdot 7=21$ shovels of sand.

Answer: 21 shovels of sand.

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