SOLUTION: kim had $1.25 in nickels and dimes in her purse. if the the number of her nickels is four more than the number of dimes, how many nickels does she have?

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Question 352784: kim had $1.25 in nickels and dimes in her purse. if the the number of her nickels is four more than the number of dimes, how many nickels does she have?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
N=D+4
.10D+.05N=1.25
.10D+.05(D+4)=1.25
.10D+.05D+.20=1.25
.15D=1.25-20
.15D=1.05
D=1.05/.15
D=7 NUMBER OF DIMES.
N=7+4=1 NUMBER OF NICKELS.
PROOF:
.10*7+.05*11=1.25
.70+.55=1.25
1.25=1.25