SOLUTION: sally has $1.50 worth of change in her pocket-all nickels and dimes. she has three times as many nickels as dimes. find the number of each.

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Question 374520: sally has $1.50 worth of change in her pocket-all nickels and dimes. she has three times as many nickels as dimes. find the number of each.
Answer by checkley79(3341) About Me  (Show Source):
You can put this solution on YOUR website!
.05N+.10D=1.50
N=3D
.05*3D+.10N=1.50
.15D+.10D=1.50
.25D=1.50
D=1.50/.25
D=6 DIMES.
N=3*6=18 NICKELS.
PROOF:
.05*18+.10*6=1.50
.90+.60=1.50
1.50=1.50