SOLUTION: If 21/2 tons of stone cost %20 what will 31/2 tons cost?

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Question 793053: If 21/2 tons of stone cost %20 what will 31/2 tons cost?
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
2.5/20=3.5/x
2.5x=70
x=70/2.5
x=$28