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Math prob

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Another way to think about this :
1/2 = 40/x

2 is 2 times the amount of 1, then that means from above x needs to be 2 times the amount of 40,so x = 2*40 = 80. Thus x = 80.

[Edited by - Concentrate on December 14, 2010 3:45:26 PM]

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