Posted by Katherine on Tuesday, April 20, 2010 at 4:45pm.
after spending 3/8 of $x he has 5x/8 left
then he spends 1/2 of that, leaving
5x/16
5x/16 = 6.25
5x = 100
x = 20
check: 3/8 of 20 = 7.5
leaving him with 20-7.5 = 12.50
1/2 of that is 6.25, leaving him with 6.25, Check!
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