SOLUTION: 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?

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Question 61059: 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?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
n = number of $5's
m = number of $10's
n + m = 12
5n + 10m = 100
5n + 10(12 - n) = 100
5n + 120 - 10n = 100
5n = 20
n = 4
m = 12 - n
m = 8
check
5*4 + 10*8 = 100
20 + 80 = 100
OK