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 tip the waitress took is part of the 27 pounds they paid. At the end, the guys have 3, the waitress has 2, and the bar has 25. So, 3+2+25=30
If I read the story and think of where the money is, it might make more sense too. (G)uys, (W)aitress, (B)ar.
Three guys go to a bar w/ 30 pounds: G = 30, W = 0, B = 0
They pay the waitress 30: G = 0, W = 30, B = 0
The manager says to give back a discount of 5: G = 0, W = 5, B = 25
She gives 3 and takes 2 out of the discount: G = 3, W = 2, B = 25
They paid the bar and tipped the waitress a total of 27 and kept 3 at the end.
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