Can you work out Luke's 'brain teaser'?
3 men walked into a restaurant and bought a meal each. It cost £10.00 each (£30.00 into total) The waiter takes the £30.00 and gives it to the cashier. The cashier tells the waiter to give £5.00 back. On the way back the sneaky waiter takes £2.00 for himself and then gives each man £1.00 each. They think that they have payed £9.00 for their meal. 3 x £9.00=£27.00 + £2.00 (that the waiter took) = £29.00.
Where did the other £1.00 go?
Please leave your answers or suggestions in comments
Do you have any puzzles or challenges that you think children, parents or staff might want to try. Please bring them to Mr. Hawdon and I will put them on the website for anyone to try.
Please don't forget Class 9 numeracy set - Mathletics homework
Comments (7)
Right, three days and three nights I've been awake now and I still can't sort it out!
Time to pull rank...
Well done Luke on your fab puzzle... if you don't explain it to me by lunchtime Monday...
YOU MISS YOUR PLAYTIME!!!
Mr Firth
Posted by Mr Firth | January 17, 2010 3:24 PM
The men THOUGHT they had paid £27 for 3 meals but it only cost £25. The waiter took £2 for himself and gave the men £1 each back (£3 in total).
This equals £30.
Is this good enough or do I need to go back to school?
Posted by Thomas Mills' Mam | January 17, 2010 6:23 PM
It is because when they got the £5 back they had payed (£25 divided by 3 ) = £8.33 each for their meals. Their extra pound made it £9.33 each, not £9 each!
(33p X 3 = £1.00)
There is the missing pound!
Posted by Katie Wilson | January 18, 2010 7:06 PM
wow! luke this is a tough one i will be up all night now trying to work htis puzzle out !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Posted by rebecca conway | January 18, 2010 7:10 PM
Right, Luke you can have your playtime back; Katie... YOU'RE IN!
I felt bad enough that Mrs Mills and I were limping slowly to defeat, with no clear answer in site. But being beaten to the answer by a pupil... ouch!
Thinking Sheet for you I think!
(Well done - you must have had a cracking maths teacher last year!)
Posted by Mr Firth | January 19, 2010 10:16 PM
Excellent work Katie, I gave up 3 days ago.
Posted by Mr. Hawdon | January 19, 2010 11:02 PM
great brain teaser
YOU ARE LUCKY YOU GOT YOU PLAYTIME BACK!!!!!!!!!!!!
Posted by kieran brown | January 21, 2010 6:05 PM