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

and y=3x.
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So, if <span>Sandy puts in x=7 shovels of cement, then she puts

shovels of sand.
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</span><span>
Answer: 21 shovels of sand.
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Answer:
82.5 miles an hour
330 ÷ 4 = 82.5
Step-by-step explanation:
Y = -3x + 4 = Slope-intercept form
Y + 3x = 4 = Standard form
Answer:
100
Step-by-step explanation:
If you are mixing a 30% solution with a 20% solution to obtain a 14% solution, you will never obtain a 14% solution.