Khan/khan-exercises — pull request #52187 by mauk81 (2013-07-06 17:09:09+00:00)
Title: fix plural in problem text, fix #47643

*isSingular(randRange( 1, 8 ))* and *{randRange( 1, 8 )} hour/s* are different numbers. i added a new variable *sleddingHours* and use it as *{sleddingHours} {plural("hour", sleddingHours)}*