Khan/khan-exercises — pull request #15816 by llarsen71 (2012-03-09 15:54:20+00:00)
Title: Update the number_line exercise to fix exercise timeline

Previously, the exercise timeline did not update the number line to show students guesses. The exercise was updated to use the custom answer type, and code was added to update the exercise timeline correctly.

One item on trello Card Number 381: https://trello.com/card/update-older-interactive-exercises-that-should-be-using-the-custom-answer-type/4d87e664967a0775082939ab/381