Three guys go to the bar and get £30 worth of drinks. They pay £10 (10*3=30) each and the waitress takes the money. Before she puts it in the till the manager notices the guys and tells her “I know these guys, give them a £5 discount”
On the way to their table the waitress decides to give the guys £3 back and keep £2 as a tip.
The guys take a pound each, so instead of paying £10 each they end up paying £9 each (9*3=27).
And the question is: if they ended up paying £27 and the waitress kept £2 where did the last pound go?
In: 397
The trick is that the whole first paragraph is true, but the second one is false and you are lulled into thinking 27+2 since it infers one pound is missing, but it is all a lie (if you simply correct the grammar into “if they ended up paying £27 ***OF WHICH*** the waitress kept £2” then the whole “where did the last pound go?” question doesn’t even make sense).
The “and” operator is tricking your brain into adding +2 to 27.
Its a language trick, not a math trick. Anyone who starts doing the math will instantly see that it doesn’t add up.
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