Question

a piggy bank contains $5.60 in nickels and dimes. the number of nickels is 8 less than 3 times the dimes. how many nickels and dimes are there in the piggy bank?

Answer 1

10d+5n=560  and n=3d-8, using this n in the first equation gives you:

10d+5(3d-8)=560

10d+15d-40=560

25d-40=560

25d=600

d=24, and since n=3d-8

n=3(24)-8

n=72-8

n=64

So there are 24 dimes and 64 nickels in the piggy bank.

Answer 2

1.50 cent because you subtracted