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Daniel [21]
3 years ago
13

Deangelo has $7 worth of dimes and quarters in a jar. He has 7 more quarters than dimes.

Mathematics
2 answers:
Aleksandr [31]3 years ago
4 0
Deangelo has 15 dimes and 22 quarters

Hope this helps
svlad2 [7]3 years ago
3 0
D=number of dimes
q=number of quarters

let's count everything in cents
dimes are worth 10 cents
quarters are worth 25 cents

10d+25q=700
divide both sides by 5
2d+5q=140


he has 7 more quarters than dimes
q=7+d
subsitute 7+d for q in other equation

2d+5q=140
2d+5(7+d)=140
2d+35+5d=140
7d+35=140
minus 35 both sides
7d=105
divide both sides by 7
d=15

sub back

q=7+d
q=7+15
q=22


22 quarters and 15 dimes
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