tony had 13 bills in his wallet. they were all fives or tens. the total amount of money in his wallet was $90. How many five dol
lar bills did he have in his wallet?
1 answer:
//I'll let x = $5, y = $10
x + y = 13
5x + 10y = 90
So, y = 13 - x
5x + 10(13 - x) = 90
5x + 130 - 10x = 90
-5x = -40
x = 8
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