If you love Maths, try working this one out.

Harry, Harold and Steve were off to Scotland for a fishing trip.

Steve made the booking for all 3 of them, for 2 nights at a local Hotel, Friday night and Saturday night.

When they arrived late in the evening, all 3 of them went into reception and were greeted by Mary, the receptionist.

"Good evening gentlemen and welcome to our Hotel, may I take your payment please" Mary said.

Steve had already got payment off Harry and Harold, and with his own payment handed over £300 to Mary.

Mary thanked them and handed over 3 keys to Steve, and said "all 3 rooms are the same, take your pick".

Steve then said to Mary "we won't be around in the mornings for breakfast on Saturday nor Sunday, we are off for early starts fishing".

Mary said "no problem, I'll let the manager know".

An hour later the manager appears, and Mary tells him what Steve had said, his reply was "Oh okay, as we have no other guests in my hotel, we won't be needing our chef. As breakfast was included in the price of their booking, can you give them this back" and gave Mary five £10 notes.

Mary said "of course, I will hand it over in the morning".

Saturday morning arrived and Harry, Harold and Steve were all set to leave for their first day fishing.

They got to reception and Harry and Harold both said they needed the loo, so off they went.

Mary said "good morning Steve, I hope all 3 of you enjoy your fishing today".

Steve said thanks and leaned on the reception desk, waiting for Harry and Harold.

Mary then thought of the £50 her manager had given her, and quick as a flash thought to herself sod it, I'm low paid, so I won't give them all the money.

Behind her back she craftily pulled 2 x £10 notes from the other 3 notes and said "Oh, by the way Steve, my manager has kindly offered all 3 of you a discount, in total £30 off your stay, as you won't be having breakfast this morning or tomorrow".

"Wow" says Steve, "how generous of him, thank you very much".

At that moment Harry and Harold appear from the toilet and Steve says "look guys, as we won't be around for breakfasts, the manager has given us a discount" and hands a tenner to Harry, another to Harold and holds his own note up in the air.

"Thats brilliant" say Harry, "so all 3 of us get a tenner knocked off our stay". Harold pipes up and says "so all 3 of us only paid £90 each for our stay, we'll all be having extra drinks tonight when we get back" and all 3 of them laugh as they go to their car.

Mary stands behind her desk and then says to herself in a very puzzled manner, "hang on, if they all had a tenner back, they did indeed only pay £90 each per room, well 3 X £90 is £270, but I only sneaked £20 in my pocket, where is the other £10"?

Where indeed ?