<PRE><B>Question 171369</B>
.05N+.10D+.25Q=3.00
D=2Q
N=D+5 OR N=(2Q)+5
.05(2Q+5)+.10*2Q+.25Q=3.00
.10Q+.25+.20Q+.25Q=3.00
.55Q=3.00-.25
.55Q=2.75
Q=2.75/.55 
Q=5 NUMBER OF QUARTERS.
D=2*5=10 NUMBER OF DIMES.
N=10+5=15 NUMBER OF NICKLES.
PROOF:
.05*15+.10*10+.25*5=3.00
.75+1+1.25=3.00
3.00=3.00
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