Lisa has quarters and dimes. she has four more quarters than dimes. if she has a total of $3.80, how many quarters and dimes does she have?

(let statement)

8 dimes ($0.80) 12 quarters ($3)

Step-by-step explanation:

D = dimes

D+4 = quarters

0.10D + 0.25 (D+4) = 3.80

0.10 D + 0.25D + 1=3.80

0.35D = 2.80

Divide both sides by 0.35

D=8

0.10*8 = 0.80

3.80-0.80 = 3.00 ($3)

$ 3.00/0.25 = 12 quarters