SOLUTION: 30 coinsˏ $2.50, how many dimes and nickels

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Question 880722: 30 coinsˏ $2.50, how many dimes and nickels
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Hints:

You have 30 coins, so n%2Bd+=+30. You can solve for d to get d+=+30-n

The coins total in value of $2.50, so 0.05n%2B0.10d=2.50

You can then plug in d+=+30-n to get 0.05n%2B0.10%2830-n%29=2.50

Solving for n gives you the number of nickels. Use that to find the number of dimes.