Posted by **M.A.** on Wednesday, July 1, 2009 at 5:15am.

Mary had some M&M candy. She ate one, then gave half of the remaining candy to Bill. She ate another candy, then gave 1/3 of the remaining to Edie, leaving 6. How many did she give away to Bill and Edie?

- math..word problem -
**y912f**, Wednesday, July 1, 2009 at 6:24am
40???

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**Dr Russ**, Wednesday, July 1, 2009 at 6:39am
If there are 6 left after Mary has given a third to Edie then there must have been 9 to start with and she gave 3 to Edie.

Before she ate one there must have been 10 sweets.

So after giving half to Bill she has 10 left there must have been 20 to start with and she gave 10 to Bill.

Thus she gave 3+10 = 13 to Bill and Edie.

Just check my maths. No idea how you got to 40.

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**y912f**, Wednesday, July 1, 2009 at 6:57am
oops, i misread the problem

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**MsPJ**, Wednesday, July 1, 2009 at 10:32am
Don't forget the one she ate before she gave 1/2 to Bill. I got that she started with 21.

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**Dr Russ**, Wednesday, July 1, 2009 at 10:58am
"Don't forget the one she ate before she gave 1/2 to Bill. I got that she started with 21" But that is not the question, the question asks "how many she gave to Bill and Edie?", NOT "how many did she start with?"

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**M.A.**, Wednesday, July 1, 2009 at 12:13pm
Thank you. I can follow the solution quite easily as explained, but I could never have come up with the solution from scratch other than just starting with numbers and trial and error. So how do you begin such a problem?

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