Khan/khan-exercises — pull request #12403 by Christi (2012-01-29 18:47:59+00:00)
Title: units, units, uuunits. units! (adding units all over)

Mostly the changes are adding units to various (13) exercises. One bug fix to reading_pictographs_2 - problem "total" was broken, found when testing my changes.

Fixes issues:
#11628, #11626, #11140, #12018, #9158, #9079, #11618

See also Trello card https://trello.com/c/Na3ahcSc: Add "x=" or units to solution area