Khan/khan-exercises — pull request #21527 by garypoison (2012-05-09 10:27:51+00:00)
Title: Conditional statements 2 exercise

Added exercise as specified in https://trello.com/card/conditional-statements-2/4d87e664967a0775082939ab/423
Note that I did not implement problem type 3 - see my comment in the Trello card because the statement should be corrected ("If a number is divisible by 5, then its last digit is a 5").