Find the number of ways that 10 dollars can be converted into dimes and quarters.
+1252 The number of quarters has to be even, because if it was odd, then it wouldn't add up.
We can have 0 Quarters all the way to 40 Quarters.
0/2 = 0, 40/2 = 20
The number of numbers between 0 to 20 is 21.
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