### Brain Teasers

# What Did I Buy?

Math
Math brain teasers require computations to solve.

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?

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?

### Answer

Question Mark bought 2 bottles of fizzy juice, 1 sandwich and 1 bag of crisps.Everything costs as follows:

Mineral water: 110QEM

Crisps: 43QEM

Sandwiches: 304QEM

Fizzy juice: 104QEM

You will notice that the difference in cost between Skid Mark and Birth Mark is 608QEM. This is because they both bought a bottle of mineral water and a bag of crisps, but Skid Mark bought 2 sandwiches so sandwiches cost (608/2=304QEM). Since Book Mark paid 938 for what she bought, 608QEM was used to buy 2 sandwiches, the rest of her money would be used to buy 3 bottles of mineral water, so one bottle costs (330/3=110QEM). Using this information you can work out what everything else costs.

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## Comments

I didn't get it because I was too lazy Anyway,What's QEM stand for?

This was so fun to work out! Great teaser.

Dec 24, 2005

Yeah, what does QEM mean?

QEM is just a currency.

I love all the different marks

I was also too lazy to figure it out

I was also too lazy to figure it out

Easy, but interesting, simple algebra and looking for workable combinations to reach 555.

Very fun and easy!!!

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!

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!!!

By the way, people don't exactly use pesos in Bangladesh...just think of QEM as a "universal" currency!!!

The reason/s you didn't figure it out has nothing to do with QEM. It could just as well been puppy teeth.

interesting teaser...enjoyed the mental workout.. keep up the great job...thanx.

Puppy teeth? How delightfully morbid- yay, wampum!

Anyway, this one was easy but took some effort to do the computations. Overall, very nice.

Anyway, this one was easy but took some effort to do the computations. Overall, very nice.

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?

oops my bad....didnt read the first line!!!!

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.

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.

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