Three men share a hotel room which cost £10 each, £30 in total. The manager realises he has made a mistake and the room should only be £25 so he gives the bellboy 5 x £1 coins to give to the men, the bellboy realises he cannot split the £5 between the three men so he gives them each £1 and keeps the remaining £2 so the men have paid £9 each for the room = £27 plus the £2 the bellboy kept makes a total of £29 where is the other £1?