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The X.X1 at the end of the number implies that there could be 1, 11, 21, 31, etc. pennies. Now, we could go through and test the instances.

.01 means that there is 1 penny. Therefore, there are 2 dimes to make .31, which does not work.

.11 means that there are 11 pennies. Therefore, 22 dimes are required, which make $2.31. This works, so there are 22 dimes.

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βˆ™ 11y ago
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Q: How many dimes is in 2.31 if there are twice as many dimes as pennies?
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