97% of adults can’t concentrate.  The proof is this simple test!

97% of adults can’t concentrate. The proof is this simple test!

This task seems very simple, but almost everyone who tries to solve it is confused.

To cope with the puzzle, you must be able to concentrate. You don’t need to know advanced math – just be able to add and subtract in your mind.

Put down the calculator, don’t try to write the numbers in a column – those are the rules.

97% of adults can’t concentrate.  The proof is this simple test!

QUESTION 1 OF 1

Begin!
Begin!

4090

4100

5000

Source: The Voice Mag

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