Marty has a piggy bank that contains $2.25. the piggy bank contains only quarters and dimes. there are twice as many dimes as quarters in the bank. how many dimes are in the piggy bank?

Let the no. of quarters be x 
No of dimes = 2x 

25x + 10 (2x) = 225 
25x + 20x = 225 
45x = 225 
x = 5 

The number of quarters is 5 

5 * 2 = 10 

The number of dimes is 10.

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