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Eight hot dogs and seven hot dog rolls cost $\$13.60$. Seven hot dogs and eight hot dog rolls cost $\$13.40$. How much, in cents, is the positive difference of the costs of a hot dog and a hot dog roll?

 Jul 22, 2019
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8d +7r =13.60

7d +8r = 13.40    subtract second equation from first equation

d - r = .20

 Jul 22, 2019

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