I have come across a puzzle, which makes no sense. Does anyone know the answer to the below?
You and two friends go on holiday. When checking out, the total bill comes to £300. You pay the bill and begin to walk out. The clerk realises that he’s made an error and hands the bellhop a £50 note to return to you. He realises that he cannot split the £50 equally, so he decides to give each guest £10 and keep £20 as a tip for himself. Hence, each guest received £10 back, meaning they only paid £90 each. This means the total paid by the three people was £270 (£90 x 3). Add in the £20 the bellhop kept and the total comes to £290. What happened to the missing £10?