SOLUTION: Sam has 30 nickles and dimes worth if $2.40. How many nickles does he have?

Question 812238: Sam has 30 nickles and dimes worth if $2.40. How many nickles does he have?
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
n + d = 30
n = 30 - d
5n + 10d = 240
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5n + 10d = 240
5(30 - d) + 10d = 240
150 - 5d + 10d = 240
5d = 90
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d = 18
n = 12
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