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 math problem is trying to convince you that you can add the money spent to the money received and get a valid answer. It’s also deceptively leaving out the 25 in the till to confuse you. It’s trying to convince you to add a debt and a credit together both as positive values.
27+2 doesn’t make sense because 27+2+25=60 (we just generated infinite money if we repeat the transaction multiple times)
The math is 27 – 2 =25
Or 27 – 2 – 25 =0 (all dollars are accounted for)
Or 27 debt | 2 credit, 25 credit
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