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We call a number peachy if every digit in the number is either a $3$ or next to a $3.$ For example, the numbers $333,$ $83,$ $303,$ and $3773$ are all peachy, but the numbers $32523,$ $786,$ $340,$ and $3999$ are not peachy. How many positive $2$-digit numbers are peachy?

 Feb 19, 2021
 #1
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There are 10 two-digit numbers with a tens digit of 3, and 10 two-digit numbers with a units digit of 3, so the answer is 10 + 10 = 20.

 Feb 19, 2021
 #2
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Sorry, but that answer is wrong.

 Feb 19, 2021

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