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CALLING THE MATHEMATICAL MIGHT OF MUMSNET ! - Please explain this maths problem to us !

(16 Posts)
NomDePlume Tue 29-Mar-05 21:25:03

Watching 'Help', this mathematical problem was given to a client to solve......


3 men are in a cafe. The bill arrives and it is £30 in total. Each man puts in £10. The waiter colects the money and takes it to the till. The manager sees the £30 and tells the waiter that he has overcharged the men, the bill should have been £25, he orders the waiter to take £5 back to them with an apology.

On his way back to the table it occurs to the waiter that the men do not know how much he has overcharged them so decides to give them £1 each (£3 in total) and pocket the other £2 for himself. He gives them the £3.

Each man put in £10 to cover the original £30 bill. Each of the 3 men was reimbursed £1, so in reality the men paid £9 each. £9 x 3 = £27. If the waiter only put £2 in his pocket, this totals £29, WHERE DID THAT £1 GO ????

HELPPPPPPPPPPPPPPPPPPPPP ! DH and I have been trying to bend our brains round it for about half an hour, to no avail

RTKangaMummy Tue 29-Mar-05 21:26:23

I remember this was on here last year

NomDePlume Tue 29-Mar-05 21:26:50

I must've missed it, been on MN for 2 years !

lilsmum Tue 29-Mar-05 21:27:08

NDP, why!!!!! lol, i hate puzzles like this, going to be trying to work this out all night now

RTKangaMummy Tue 29-Mar-05 21:27:26

But then it was a dumb blond waitress


Gobbledigook Tue 29-Mar-05 21:30:28

This is soooooooo old!

lilsmum Tue 29-Mar-05 21:31:03

right someone must know the answer, please!!!

SenoraPostrophe Tue 29-Mar-05 21:31:29

the "other £1" didn't go anywhere because the sum isn't the right one. The bill was 25, so nothing does or should add up to £30. In reality, each man paid £9 = £27. The bill was only £25, but they paid the other £2 to the waiter. Does that make sense?

JanH Tue 29-Mar-05 21:33:06

last time

(I can't do it myself!)

Posey Tue 29-Mar-05 21:33:56

God knows!
If you still haven't got the answer in half an hour, I'll ask dh when he gets in from work.

lilsmum Tue 29-Mar-05 21:34:27

oh yeah i get it now, god that a good trick of the mind!

NomDePlume Tue 29-Mar-05 21:36:56

Not really no !

Sums for me were.....

Original bill - £30 / 3 = £10 each

Waiter takes money - £30. Is told it is wrong and to take £5 back - £30 - £25 = £5.

This leaves the till with £25 and the waiter with £5. Waiter pockets £2. £5 - £2 = £3

He shares the £3 with the other men. £3 / 3 = £1 each

If each man paid in £10 and got £1 back then they only paid £9 each. so... 3 x £9 = £27.

£27 + £2 the waiter pocketed = £29.

I still don't get it !!!!!

NomDePlume Tue 29-Mar-05 21:38:25

ahhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh !

In the time it took me to post that mumbling nonsense, the link was posted.... The fog lifts....

SenoraPostrophe Tue 29-Mar-05 21:39:46

why are you adding the £2 to the £27?

really it's £27 minus £2 = the £25 in the till. Since the men have change out of their £30 why should anything add up to £30?

Potty1 Tue 29-Mar-05 21:40:29

Just given this dh who's the other side of four pints of lager. He's struggling with it as we speak....... PMSL!!

Aero Tue 29-Mar-05 21:48:40

brilliant - off to confuse dh with this one!

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