Question

Jenna always throws loose change into a pencil holder on desk and takes it out every 2 weeks. this time it is all nickels and dimes. There are 7 times as many dimes as nickels and the value of the dimes is $6.50 more than the value of the nickels. How many dimes does Jenna have?
d = 7n
10d = 650+5n

10(7n) = 650+5n
65n = 650
n=10
so, d=70

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