Thursday, December 30, 2010

Whole Number P6

Wilson purchased a certain number of wallets at $6 each. If he had purchased those at $8 each, he would have purchased 20 fewer wallets. How much money did he have? [Ans : $480]


6 : 8 = 3 : 4         Ratio of the number is inversely proportional to the price

1 u --> 20

4 u --> 4 x 20 = 80       Note: 4 u at $6 (3 u at $8) [inverse proportion]

6 x 80 = $480

He had $480. 

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