SOLUTION: mike paid for his coffee in the morning with 19 coins consisting of dimes and quarters. If the cost of the coffee was $2.95, how many coins were quarters? write an equation and sol

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Question 1022646: mike paid for his coffee in the morning with 19 coins consisting of dimes and quarters. If the cost of the coffee was $2.95, how many coins were quarters? write an equation and solve.
Answer by CubeyThePenguin(3113) About Me  (Show Source):
You can put this solution on YOUR website!
d = number of dimes
q = number of quarters

d + q = 19
10d + 25q = 295

Multiply the first equation by 25.

25d + 25q = 475
10d + 25q = 295

Subtract to get 15d = 180, so d = 12.

Mike had 12 dimes and 7 quarters.