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?

Question 49368: 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 aaaaaaaa(138) (Show Source): You can put this solution on YOUR website!
number of $5 bills = x
number of $10 bills = y

We conclude that:

value of $5 bills = 5x
value of $10 bills = 10y

Therefore:

Solved by pluggable solver: SOLVE linear system by SUBSTITUTION

Solve:
We'll use substitution. After moving 10*y to the right, we get:
, or . Substitute that
into another equation:
and simplify: So, we know that y=8. Since , x=4.

Answer: .

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