Dan has a total of 12 bills in his wallet some are $5 and the rest are $10. the total value of the $12 is $115. How many $5 bills and how many $10 bill does he have?

f+t=12

5f+10t=115

solve for f in equation 1

f=12-t

substitute into eqn 2

5(12-t)+10t=115

60+5t=115

5t=55

t=11

substitute back into eqn 1

f+11=12

f=1

One five , and 11 tens.

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