Question 436632
n+d+q=45
n+(n+5)+q=45
2n+5+q=45
q=40-2n
5n+10(n+5)+25(40-2n)=630
5n+10n+50+1000-50n=630
420=35n
n=12
Joe has 12 nickels, 17 dimes, and 16 quarters..