Question 305594
d+n=35 or d=35-n
.05n+.10d=3.30
.05n+.10(35-n)=3.30
.05n+3.50-.10n=3.30
-.05n=3.30-3.50
-.05n=-.20
n=-.20/-.05
n=4 nickels.
d=35-4=31 dimes.
Proof:
.05*4+.10*31=3.30
.20+3.10=3.30
3.30=3.30