SOLUTION: Irene has $4.50 in her coin bank in nickels and dimes. The number of dimes is twice the number of nickels. How many dimes are there?

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Question 242179: Irene has $4.50 in her coin bank in nickels and dimes. The number of dimes is twice the number of nickels. How many dimes are there?
Answer by nyc_function(2741) About Me  (Show Source):
You can put this solution on YOUR website!
5x + 10y = 450
10y = 2(5x)
Can you take it from here?