Answer:
50 pounds of beans costs $40
Answer:
C
Step-by-step explanation:
So if x is the number, then 4 times the number would be 4x and adding that to -8 would be 4x + (-8) and then 12 times the number would be 12x, so you have 4x + (-8) = 12.
Then, solve:

subtract 4x from both sides

divide both sides by 8

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To figure out percents you can set it up like:
80/160 = x%/100%
Then cross multiply:
160x = 8000; now divide each side by 160 to isolate x, and you get x = 50%
The answer makes sense, because 80 is half (or 50%) of 160
Its 80 because if you find perfect square around the number 80 you'd get
√64 and √81
which would be 8 and 9