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Find numbers in a list that equal a specified number

Posted on 2016-10-11
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Last Modified: 2016-10-31
I have a list of numbers in Excel (for Mac) that add up to a specific number, but I'm not sure which numbers equal that number. How do I isolate the numbers in the list that add up to the specific number?
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Question by:baadayakazi
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9 Comments
 
LVL 49

Expert Comment

by:Martin Liss
ID: 41839314
Depending on the list length you might have more than one combination. Also with anything but a very short list it would probably take some time to check all the combinations, which if I remember my math, if the were 15 numbers there would be 15 x 14 x 13 x 12 x etc numbers to check. My calculator tells me that that's 1.3 trillion combinations!
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Author Comment

by:baadayakazi
ID: 41839329
I've seen a few solutions (including this one on EE). But none seem to work.
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LVL 49

Expert Comment

by:Martin Liss
ID: 41839367
How many numbers are we talking about?
Will the total always be the sum of the same number of numbers?
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Author Comment

by:baadayakazi
ID: 41839377
Approx 100 numbers. Its for a list of transactions that ended up on a report with a total - the total came from some subset of those 100 numbers. I need to run this a few different times.
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LVL 49

Expert Comment

by:Martin Liss
ID: 41839391
I haven't gotten it to work yet but from what I read, you can use the Solver add-in to do what you want.
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Author Comment

by:baadayakazi
ID: 41839393
I couldn't get the solver to work either for some reason.
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LVL 49

Accepted Solution

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Martin Liss earned 2000 total points (awarded by participants)
ID: 41839403
I found an example on the web that works it's in the attached workbook where I wanted to find the numbers that added to 24. Solver changed column B to 1 for the numbers that added to 24 (there's at least one other solution). I'm going to try to post a picture of the web page because EE doesn't like me posting "blind links".
28975810.xlsx
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LVL 49

Expert Comment

by:Martin Liss
ID: 41839470
BTW the site says
Using more than 20 values (Column A) is not recommended unless you have a lot of spare time.
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