The Cost of Oil

27) If 8 quarts of oil cost $10.64, how much would 6 quarts cost?

           8         6
         -----  =  -----
         10.64       x


        8(x) = 6(10.64)

        8x = 63.84

         x = 7.98


Notice, in double-checking our work, how it balances out:

     6 * 10.64 = 8 * 7.98

         
         63.84 = 63.84