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.

@freemo

Well there isn't a solution if you using only those numbers.

One can use decimal number instead or use algebra or pre calculus formula.

@inditoot There is a solution. Since you cant use anything but those numbers algebra and pre calc aren't options. I see no issue with using decimal numbers though, thats what most people assume anyway, or did you mean binary? You'd be welcome to use binary here except 30 is not a binary number so you cant (binary only has 1 or 0's in it)

@inditoot That would be a mathematical operator. The only thing you can put in those boxes are the numbers listed.

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Solution 

@inditoot

13 + 11 + 1 = 30

the numbers were base 5 numbers. Though solutions in other bases (like base 9) also work so there are multiple answers.

Solution 

@freemo

Solution to these questions are never funny

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