SOLUTION: There are 11 cookies on a plate. During one day several were eaten. 12 cookies were added to the plate which now has 17 cookies on it. How many cookies were eaten?

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Question 864278: There are 11 cookies on a plate. During one day several were eaten. 12 cookies were added to the plate which now has 17 cookies on it. How many cookies were eaten?
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Let x = number of cookies eaten

You start out with 11 cookies. Then you subtract off x cookies that are eaten. Afterwards, you add on 12 more cookies. So you'll have 11-x%2B12 cookies. This is equal to 17.

So,


11-x%2B12=17


23-x=17


-x=17-23


-x=-6


x=6


This means 6 cookies were eaten.