Let me try it in layman term. Each salesman paid 10 dollars, so 10 +10 +10 = 30
They get back 3 dollars, so -1, -1, -1, totaling 27, in other word: 9+9+9=27.
The deception here is, if the total they paid out is 27, and the bell boy kept 2, where is is the missing 1. Graphically you can see the deception. From the total pool of 30, the salesmen kept the 3 in red. The bellboy kept the 2 in green. And the manager kept the 25 in blacks. The answer is the "missing 1" is a mathematical illusion coming from the idea that 9*3=27+2=29 should equal 10*3=30. It's a good trick question, but getting 3 dollars back from your original 30 changes the total sum to 27 (30 no longer applies as the total sum), which is the same as paying 9 each. Out of that 27 total, the bellboy kept 2 and the Manager kept 25. Adding the 27 to the 2 is an illusion of trying to get 30, because the bellboy made the mistake of not returning the total 5, but keeping 2.
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
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