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Math brain teasers require computations to solve.

 Puzzle ID: #27665 Fun: (2.74) Difficulty: (2.04) Category: Math Submitted By: Question_Mark Corrected By: cnmne

When Skid Mark walked into a shop, he bought a bottle of mineral water, 2 sandwiches and a bag of crisps. This cost him 761QEM.
Later on, Exclamation Mark goes into the same shop and buys a sandwich and a bottle of fizzy juice. This cost him 408QEM.
Later, Birth Mark goes into the same shop and buys a bottle of mineral water and a bag of crisps. This cost her 153QEM.
Later on, Book Mark goes into the same shop and buys 3 bottles of mineral water and 2 sandwiches. This cost her 938QEM.
Later on, Question Mark goes into the same shop and buys 4 items. This cost him 555QEM. What did Question Mark buy?

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 dude7 Dec 24, 2005 I didn't get it because I was too lazy Anyway,What's QEM stand for? TheEarthling Dec 24, 2005 This was so fun to work out! Great teaser. (user deleted) Dec 24, 2005 Yeah, what does QEM mean? Question_Mark Dec 24, 2005 QEM is just a currency. WJSMama Dec 27, 2005 I love all the different marks I was also too lazy to figure it out mr_brainiac Jan 03, 2006 Easy, but interesting, simple algebra and looking for workable combinations to reach 555. Winner4600 Jan 07, 2006 Very fun and easy!!! Brainy_1 Jan 11, 2006 I love the names of your relatives!! But I have no clue as to what a QEM is so I was completely lost! Great teaser though! Winner4600 Jan 12, 2006 Who cares what a QEM is? The point here is the amount... By the way, people don't exactly use pesos in Bangladesh...just think of QEM as a "universal" currency!!! roscoep Jan 30, 2006 The reason/s you didn't figure it out has nothing to do with QEM. It could just as well been puppy teeth. darqlily Feb 02, 2006 interesting teaser...enjoyed the mental workout.. keep up the great job...thanx. appleandeve Sep 28, 2006 Puppy teeth? How delightfully morbid- yay, wampum! Anyway, this one was easy but took some effort to do the computations. Overall, very nice. Peerie Mar 08, 2007 the solution only gives u the prices of wat each item costs.....it doesnt giv u WAT items were bought? does anybody know wat items were bought? Peerie Mar 08, 2007 oops my bad....didnt read the first line!!!! javaguru Jan 27, 2009 Very easy, didn't need to break out the pencil and paper. Would have been more interesting if you weren't able to pin the cost of each item down exactly. For example, knowing that a bottle of mineral water and a bag or crisps was x, you can use that as two items without having to know the cost of each.