Missing Pound

A Maths Starter of The Day

Three people enjoy a meal at a Thai restaurant. The waiter brings the bill for £30 so each person pays £10.

Later the chef realises that the bill should have only been £25 so she sends the waiter back to the table with £5. The waiter wasn't very good at Maths and couldn't figure out how to divide the £5 so he gave each person a £1 and kept £2 for himself.

So....the three people have paid £9 each for the meal.
9x3=27

The waiter kept £2
27+2 = £29

What happened to the other pound? Does this make sense?

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Keywords: Starter | Money | Problem Solving | Puzzles | Arithmetic

"I think they are very good - some of the 'numeracy' starters were a little dry but you seem to have improved them recently. Thanks for taking the time to put these together and making them free. You've earnt your gold star!"

Chris, Exeter
Tuesday, June 20, 2006

 

"Good Grief! That had me going (despite being a 30 year old maths graduate!) The waiter's £2 came out of the £27 paid by the three diners. They did pay £27 (3 x £9) and £25 went to the kitchen and £2 to an unscrupulous waiter. Thanks for making me think though!"

Anne, Blackburn, Lancashire
Wednesday, May 23, 2007

 

"The £27 they paid is the £25 for the meal and the £2 the waiter kept."

9yma3, Northcliffe School
Friday, June 08, 2007

 

"Excellent. Thank you very much for a fabulous set of starters. I use the 'weekenders' if the daily ones are not quite what I want. Brilliant and much appreciated."

*Nikki Jordan, Braunton School, Devon
Tuesday, June 19, 2007

 

"£30 shared equally between three is £10 each.

£25 shared equally between three is £8.33333......(recurring).

(£8.3333...) X 3 + £5 = £10 X 3

So the pound is still there!"

Class 8A (Miss Yuen), St Philomena's School, Carshalton
Tuesday, June 19, 2007

 

"Right

The £30 is spead out like this

Restaurant:- £25

Waitor:- £2

Customers:- £3

so 25 + 2 + 3 = £30 so the pound is still there

That Waitor is "NAE NICE""

Stuart Don, Aberdeenshire
Tuesday, June 19, 2007

 

"Man thats hard that'll keep me thinking but if they all payed 10 came back with 5, £1 for every one = £23 + £2 = 25 help me!"

Joss Dutton, Class 9T3, National Comprehensive School
Wednesday, October 17, 2007

 

"The £30 is still there!"

Faizah, Newcastle
Monday, October 22, 2007

 

"Here's the real sum;

£25 for Bill !
£3 for People !
£2 for Waiter ! SOOOOOOOO......

£25 + £3 + £2 = £30 so the pound hasn't gone anywhere."

Katie n Shaz n Cyan n Jess n Jess !, Menzies High School
Friday, December 14, 2007

 

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This starter has scored a mean of 3.7 out of 5 based on 60 votes.
 

  

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Answers

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