Rachel B.

asked • 04/13/18

Using O-9, what 4 numbers adds up to 25

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Inactive Tutor answered • 04/13/18

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There are several combinations.  Examples:
 
1 + 2 + 3 + 19 = 25
 
1 + 5 + 9 + 10 = 25
 
2 + 6 + 7 + 10 = 25
 
etc.
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Inactive Tutor

There are effectively infinite answers to this.  Pick any 3 numbers, add them up and subtract the sum from 25 to get the 4th number:
 
-1156, 347, 54
 
25 - (-1156 + 347 + 54) = 780
 
-1156 + 347 + 54 + 780 = 25
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04/13/18

Inactive Tutor

And they do not even have to be integers!
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04/13/18

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