SOLUTION: Ron has 15 coins with a value of $2.55. The coins are nickels and quarters. How many of each coin does he have?

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Question 1006406: Ron has 15 coins with a value of $2.55. The coins are nickels and quarters. How many of each coin does he have?
Found 2 solutions by Alan3354, ikleyn:
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Ron has 15 coins with a value of $2.55. The coins are nickels and quarters. How many of each coin does he have?
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q + d = 15
25q + 10 d = 255
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Answer by ikleyn(52834) About Me  (Show Source):
You can put this solution on YOUR website!
.
Ron has 15 coins with a value of $2.55. The coins are nickels and quarters. How many of each coin does he have?
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q + n = 15
25q + 5n = 255
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I also can solve it using the mental math only:

q = %28255-15%2A5%29%2F%2825-5%29 = %28255-75%29%2F20 = 180%2F20 = 9 quarters.

n = 15 - 9 = 6 nickels.

See the lesson  Solving coin problems without using equations  in this site.