Andy has $240. He had twice as much money as Carl. Carl spent some money and Andy had 6 times as much money as Carl in the end. How much did Carl spend?
Carl must have started with $120
So
6 (120 - S) = 240
720 - 6S = 240
720 - 240 = 6S
480 = 6S
480 / 6 = 80 ......Carl spent $80
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