SOLUTION: Joe has a collection of nickels and dimes that is worth 6.00. If the number of dimes were doubled and the number of nickels were increased by 6, the value of the coins would be $9.

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Question 250599: Joe has a collection of nickels and dimes that is worth 6.00. If the number of dimes were doubled and the number of nickels were increased by 6, the value of the coins would be $9.90. How many dimes does he have?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
5n+10d=600
10*(2*d)+5*(n+6)=990