Answer:
15 Quarters, 20 Nickels, and 5 Dimes
Explanation:
Dimes = y
Quarters = x
Nickels = x+5
y:
2x+5+y=40
y=35-2x
Solve:
5(x+5)+25(x)+10(y)=525
Substitute y:
5(x+5)+25(x)+10(35-2x)=525
30x+25+350-20x=525
10x=150
x=15
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