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 ****

Comments

In Channel

24: Santa's big sleigh [****]

2016-12-2503:59

23: Your prime choice [***]

2016-11-0604:58

22: Split the check [*]

2016-10-0202:41

21: The faulty odometer [***]

2016-09-0402:40

20: The middle digit [**]

2016-08-2802:51

19: The token tax [**]

2016-08-1402:44

18: The circular track [***]

2016-07-3106:34

17: The red one [***]

2016-07-2403:35

16: In 80 days [*]

2016-07-1704:27

15: Coats of paint [***]

2016-07-0303:41

14: O gnats, tango! [**]

2016-06-1903:31

13: Order of operands [*]

2016-06-0508:10

12: One light switch [****]

2016-05-2905:48

11: The loopiest puzzler [***]

2016-05-2203:00

10: Eight's too many [**]

2016-05-1506:14

09: Coin flip winner [***]

2016-05-0806:34

08: Strawberry ice cream [***]

2016-05-0103:21

07: Kiana's twin brothers [*]

2016-04-2403:17

06: That sounds accurate [***]

2016-04-1702:35

05: Ted's three statements [**]

2016-04-1002:04

00:00

#box-pro-ellipsis-176063511589785{-webkit-line-clamp:2;}20: The middle digit [**]

20: The middle digit [**]

Wes Carroll

20: The middle digit [**]