SOLUTION: Robert has 50 coins, all in nickels and dimes, amounting to $3.50. How many nickels does he have?

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Question 424233: Robert has 50 coins, all in nickels and dimes, amounting to $3.50. How many nickels does he have?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
n+d=50
5n+10d=350
5n+5d=250
5d=100
d=20
n=30
Robert has 30 nickels and 20 dimes..