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how do i solve for a triangle in half with numbers in column a and numbers in column b

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1 Answer

Observe that the numbers in column b are one less than twice column a.

Given:

5                    9

6                    11

20                   39

3                     __

10                   __

11                   __

__                   29

This reduces to:

5          4           9

6          5          11

20        19         39

3            2          5

10          9           19

11         10           21

15          14         29 

The middle column was added by me for clarity.  You may omit it.