Fellas, I'm going to hit you with 10 levels; here then is Level 2.

A customer at a 7-11 store selected four items to buy, and was told that the cost was $7.11. He was curious that the cost was the same as the store name, so he enquired as to how the figure was derived.

The clerk said that he had simply multiplied the prices of the four individual items.

The customer protested that the four prices should have been added , not multiplied . T

The clerk said that that was OK with him, but, the result was still the same: exactly $7.11.

What were the four prices?

3, no wait............4, no hold on a minute............no, 13,000 I think.

Took me a while

1.25, 1.20, 1.50 and 3.16

Took me a while

1.25,  1.20, 1.50 and 3.16

Yep, that is correct!

Yeah!!

Got it!

£345.15

Oh no! Wait!!

is it 1.25, 1.20, 1.50 and 3.16?

They were all the same item so it wasn't necessary to add them up you can multiply by four!

Oh no wait...

Took me a while

1.25,  1.20, 1.50 and 3.16

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can you post the mathmatical proof ? or did you use brute force

clue : use simultaneous equations !!

Took me a while

1.25,  1.20, 1.50 and 3.16

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can you post the mathmatical proof ? or did you use brute force

clue : use simultaneous equations !!

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Better clue: use simultaneous Googling: http://math.ucsd.edu/~mathclub/games/brain...ry_slurpee.html

ooops

ooops

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Don't worry - I nearly posted that answer too

Moved to the new Jokes and Puzzles forum

/admin/mods

can you post the mathmatical proof ? or did you use brute force

Brute force. But with a few boundaries. Everything added is 7.11. That maximizes the search for numbers.

Multiplying 7.11 times hundred will help. Makes calculations a lot simpler.

As it are 4 numbers multiplied together you can find factors.

One of them is 79 or 158 or 237 or 316.

Small routine in a calculator or computer and a second later you have the solution.