Posted by **Anonymous** on Monday, October 1, 2007 at 6:10pm.

1. I did it this way, but it doesn't check right

2(10-y)=30

_ _

2 2

(10-y)=15

+10 +10

y = 25

Check: 2 (10-15) = 30

-30 is not equal to 30!!!

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