SOLUTION: if 2 1/2 cost $20, how much do 3 1/2 cost

Question 632370: if 2 1/2 cost $20, how much do 3 1/2 cost
Answer by Edwin McCravy(20055) (Show Source): You can put this solution on YOUR website!
if 2 1/2 cost $20, how much do 3 1/2 cost?

This one is more easily with decimals. Use 1/2 as .5
Consider the problem this way:

if 2.5 cost $20, how much do 3.5 cost?

2.5 is to $20 as x is to 3.5

 = 

Cross-multiply:

(2.5)(x) = (20)(3.5)
    2.5x = 70
     = 
       x = $28

Edwin

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