SOLUTION: Logan saves $5.50 in dimes and quarters over a week. He has 20 more dimes than quarters. Find the number of dimes and quarters he saves.

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Question 1099617: Logan saves $5.50 in dimes and quarters over a week. He has 20 more dimes than quarters. Find the number of dimes and quarters he saves.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
10D%2B25Q=550
2D%2B5Q=110
and
D=Q%2B20
Substituting,
2%28Q%2B20%29%2B5Q=110
2Q%2B40%2B5Q=110
7Q=70
Solve for Q then use either equation to solve for D.