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This one's great. Whoever would have guessed that 4 divided by 2 equals 2! :wink: Think of a number. Double it. Add 10,000,000. Halve the number. Take away the number you first thought of. Your answer is 5,000,000.

No worries. The issue is that the last line of the question says "That's £27, with £2 to the waiter" inviting you to add the two together, when in fact the £2 tip to the waiter is already included in the £27 (it's £25 dinner + £2 tip).

As others have said, it is the phrasing of the question that is designed to make it sound complicated. The diners pay £10 each. So that's £30 in total. The waiter brings back a £5. Each diner takes a pound back, £3 in total. They've now paid £9 each. There's £27 left (£30 - £3). The waiter...