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

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 Question 632370: if 2 1/2 cost \$20, how much do 3 1/2 costAnswer by Edwin McCravy(8999)   (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```