Khan/khan-exercises — Issue #14740: Adding and subtracting decimals word problems - difficulty
Author: KhanBugz
Created: 2012-02-27 17:14:10+00:00
State: open
Labels: ie8, ie9, other, win7

i don't understand the concept of kan academy.

[adding_and_subtracting_decimals_word_problems.html?seed=171&problem=rainfall](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/adding_and_subtracting_decimals_word_problems.html?seed=171&problem=rainfall&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/adding_and_subtracting_decimals_word_problems.html?seed=171&problem=rainfall&debug&activity=%5B%5D)

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