Khan/khan-exercises — Issue #12359: Rate problems 1 - adding the  orange  ones  together dont  understand 
Author: KhanBugz
Created: 2012-01-28 22:10:58+00:00
State: open
Labels: chrome, other, win7

adding 2 orange equations
...dc + ds = 104
.+.- dc (-22/27) *ds = -88should equal
ds +(-22/27) * ds = 16
where does (5/27)*ds = 16
how they get the 5 ?

[rate_problems_1.html?seed=86&problem=original](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/rate_problems_1.html?seed=86&problem=original&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/rate_problems_1.html?seed=86&problem=original&debug&activity=%5B%5B%22hint-activity%22%2C%220%22%2C235%5D%2C%5B%22hint-activity%22%2C%220%22%2C273%5D%2C%5B%22hint-activity%22%2C%220%22%2C341%5D%2C%5B%22hint-activity%22%2C%220%22%2C365%5D%2C%5B%22hint-activity%22%2C%220%22%2C408%5D%2C%5B%22hint-activity%22%2C%220%22%2C515%5D%2C%5B%22hint-activity%22%2C%220%22%2C726%5D%2C%5B%22hint-activity%22%2C%220%22%2C952%5D%5D)

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Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/15.0.874.121 Safari/535.2

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