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tester [92]
3 years ago
14

A family member has some five dollar bills and one dollar bills in their wallet. Altogether she has 18 bills and a total of $62.

How many bills does she have?
Mathematics
1 answer:
Pepsi [2]3 years ago
7 0
X - the number of five dollar bills
y - the number of one dollar bills

She has 18 bills in total.
x+y=18 \\ y=18-x

She has $62.
5x+y=62 \\
y=62-5x

Set both expressions equal to each other:
18-x=62-5x \\
-x+5x=62-18 \\
4x=44 \\
x=11 \\ \\ y=18-x=18-11=7

She has 11 five dollar bills and 7 one dollar bills.
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