SOLUTION: Mary emptied the change in the bottom of her purse. She found all quarters and dimes, worth a total of $10.25. The number of quarters was 7 less than twice the number of dimes. How

Question 263592: Mary emptied the change in the bottom of her purse. She found all quarters and dimes, worth a total of $10.25. The number of quarters was 7 less than twice the number of dimes. How many of each type of coin did she have?
Answer by drk(1908) (Show Source): You can put this solution on YOUR website!
This is a money equation. We need two equations.
(i)
(ii)
step 1 - substitute (ii) into (i) to get
(iii)
step 2 - distribute to get
(iv)
step 3 - combine like terms to get
(v)
add 175 to get
(vi)
d = 20
and from (ii)
q = 33

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