SOLUTION: David has collected $6.50 in nickels and dimes. If he has 75 coins, how many of each kind of coin does he have?

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Question 43107: David has collected $6.50 in nickels and dimes. If he has 75 coins, how many of each kind of coin does he have?
Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
d+n=75
10d+5n=650 & d=75-n then 10(75-n)+5n=650 750-10n+5n=650 or 100=5n or n=20 &
d=75-20 or d=55
proof 10*55+5*20=650 or 550+100=650 or 650=650