Posted by **Anonymous** on Saturday, April 28, 2007 at 4:00am.

Anna has 12 bills in her wallet, some $5 and some $10. The total value of the bills is $100. How many of each bill does Anna have? is this how i do this?

x+y=12

5x+10y=100

y=12-x

5x+10(12-x)

5x+120-10x=100

5x-10x=2-5x=20

x4

y8

Looks good to me.

Matt

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