20: The middle digit [**]

Update: 2016-08-28

Description

How many three-digit numbers satisfy the property that the middle digit is the average of the first and the last digits?
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Spiciness: ** out of ****

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00:00

#box-pro-ellipsis-173522518124651{-webkit-line-clamp:2;}20: The middle digit [**]

20: The middle digit [**]

Wes Carroll

20: The middle digit [**]