You are a genius if you can solve this within 5 minutes
Three friends check into a hotel room that costs £30.
They each pay £10, totaling £30.
Later, the manager realizes the room should only cost £25.
He gives £5 to the bellboy to return to the guests.
The bellboy gives £1 back to each guest and keeps £2.
Now each guest paid £9 (3 × £9 = £27), and the bellboy kept £2.
£27 + £2 = £29…
**Where is the missing £1?*
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