Question 72117
N+D=50 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.
N+20=50
N=30 NUMBER OF NICKELS
PROOF
5*30=10*20=350
150+200=350
350=350