Respuesta :

irspow
You are told that:

n=6d and 10d+5n=120  (using cents :P) now using n from the first equation in the second equation gives you:

10d+5(6d)=120

10d+30d=120

40d=120

d=3, and since n=6d

n=18

So there are 3 dimes and 18 nickels.
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