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# Blog

2018-12-08

## Christmas card 2018

Comments in green were written by me. Comments in blue were not written by me.
@Carmel: It's not meant to check your answers. It only shows up red if the number you enter cannot be split into valid pairs (eg the number has an odd number of digits or one of the pairs of digits is greater than 20).
Matthew

The script for checking the answers doesn't work properly
Carmel

Thank you Shawn!
SueM

So satisfying!
Heather
×1
Great puzzle problems! Hint on #9: try starting with an analogous problem using smaller numbers (e.g. 3a + 10b). This helped me to see what I had to do more generally.
Noah
×1
@Seth: try solving it for 3a+4b, 3a+5b, 4a+5b, etc and look for patterns
Matthew

Loved these puzzles! I have no idea how to approach #9, though. Will the solutions be posted at any point? Or, can anyone provide a hint to how to approach it?
Seth

Blaine said I'd like the puzzle, and he was right, too.
Margaret G
×1
Great puzzles. Especially enjoyed #9. Thanks for the entertainment!
John
×1
Think I got it! A sure sign of spring. number 9 was a struggle.
Mike
×1
Someone told me I would like this puzzle and they were right!
Blaine
×1