A nice little challenge for the day. Attached is the image for the question/challenge. A few notes

1) you must fill in all the boxes
2) you can not add any symbols into the box other than the provided numbers.
3) you cant use a trick of the wording to solve this, it must be solved with mathematical trickery
4) the answer is not "no" there is an actual solution by picking 3 numbers.

Solution, maybe cheating 

@freemo

Each box can be filled with 11₉ which is equal to 10 in decimal. 10 + 10 + 10 = 30.

Solution, maybe cheating 

@khird you filled int he box with 10's though not 11's, 30 doesnt exist in binary base.

Solution, maybe cheating 

@freemo I never used binary, only bases nine and ten (decimal).

11₉ + 11₉ + 11₉
= 10₁₀ + 10₁₀ + 10₁₀
= 30₁₀ = 30

Solution, maybe cheating 

@khird Can you do it with consistent bases across the whoe equation?

Solution, maybe cheating 

@freemo You mean that if I interpret the boxed numbers as a certain base, I have to do the same for the 30 so as not to mix bases?

Interpreting everything in base nine:
11 + 11 + 7 = 30

The decimal interpretation would be:
10 + 10 + 7 = 27

Follow

Solution, maybe cheating 

@khird There ya go :) other bases also work but thats one answer :)

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