SOLUTION: sand/gravel = 4/5 = 64/x

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Question 97508: sand/gravel = 4/5 = 64/x
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
Multiply x times each side. 4x/5=64
Multiply 5/4 times each side. x=64*5/4=80
Ed