# math

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if you have 15 coins in a bag and their total amount is \$2.70 how many quarters and dimes are in the bag? Use substitution to solve

• math -

q+d=15
.25q+.10d=2.70

d=15-q

.25q+.10(15-q)=2.70
.25q+1.50-.10q=2.70
.25q-.10q=1.20
.15q=1.20
q=8

q+d=15
8+d=15
d=15-8
d=7

d stands for dimes
q stands for quarters

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