Question 89733
n+d=50 or n=50-d
5n+10d=350 now substitute (50-d) for n in this equation & solve for d:
5(50-d)+10d=350
250-5d+10d=350
5d=350-250
5d=100
d=20 number of dimes.
50-20=30 number of nickles.
proof
5*30=10*20=350
150+200=350
350=350