Question

1) Nishi has a total of 18 coins that are nickels and

Answer 1

I believe it’s 3 pennies and 15 nickels yea it is because
3*0.01=0.03, and
15*0.05=0.75 and
0.75+0.03=0.78 and
3+15=18.

Did I confuse you or no? Sorry if I did.