a student has some $1 and $5 bills in his wallet. he has a total of 11 bills that are worth $35. how many of each type of bill does he have

Question

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Answer 1

1x + 5y = 35

x + y = 11, x = 11 - y

Substitute:

11 - y + 5y = 35

4y = 24

y = 6,

x = 5