Question 816996: Phillip has $2.10 in nickels and dimes. If he has a total of 31 coins, how many of the coins are nickels?
Answer by TimothyLamb(4379)   (Show Source):
You can put this solution on YOUR website! 5n + 10d = 210
n + d = 31
d = 31 - n
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5n + 10d = 210
5n + 10(31 - n) = 210
5n + 310 - 10n = 210
5n = 100
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n = 20
d = 11
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