Big Thanks to Bobo The Bear for sending in this very nice lateral thinking puzzle he created:
The following two-digit numbers all have something in common:
11, 15, 20, 40, 55, 60, 90
There is only one other two-digit number that shares the same feature. What is that number, and what do they all have in common? The 1st reader that figures this out will win a RUNES puzzle package (not too late to buy for a great Christmas gift!). The 2rd and 3rd to figure it out will get the Smartkit PDF puzzle book.
Will announce winners (and all who can figure it out!) before the week is over. If you can figure it out, enter answer below in comment section.