Using the digit 7 five time, place the basic arithmetic signs in between the digits to obtain a total of 540

- anonymous

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- schrodinger

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- anonymous

nice question.....

- anonymous

I know, it's been driving me nuts

- anonymous

can you join two 7s together to form 77?

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## More answers

- anonymous

Nah, you gotta put the signs in between each one

- anonymous

You're going crazy, aren't you?

- anonymous

this question is right r u sure?

- anonymous

because if it is not then bad things will happen

- anonymous

Yeth, I'm pretty sure it's the question

- anonymous

And now everyone's thinking...

- anonymous

It would be fast to do with computer code, any one good with programming ?

- wasiqss

certainly question of the week

- anonymous

yes certainly

- TuringTest

if it doesn't get solved here put it in the meta-math section for future reference

- anonymous

I've really been trying this for a while and I think it's messed up
anyone else think it's impossible?

- anonymous

as in, it's total overload here

- anonymous

i'm not sure if this fits the rules but
77 x 7 + (7 / 7) gives 540

- TuringTest

+ - / and * only, right?
no squaring or anything?

- anonymous

concatenation isn't arithmetic right?
nice work jimmyrep btw

- anonymous

jimmyrep, if no one can find a solution without the placing two 7s together, I'll use your solution

- anonymous

ok

- anonymous

i don't think you can do it without joining two 7s together, jimmy rep has the right answer.

- anonymous

77 is probably not allowed

- wasiqss

jimmy rep yehh 77 not allowd

- anonymous

It's probably not, but if it isn't I think it's impossible. I've been over this for over two hours, can't do anything to solve it. Yes, two hours, that's how obsessed I am with this question.

- anonymous

these types of question are obsessive!

- anonymous

Yep

- anonymous

you can't do it because 540 is not divisible by 7.

- anonymous

I KNEW IT! All that time wasted, I COULD'VE BEEN PLAYING TETRIS!

- anonymous

lol

- anonymous

Sweet baby turtles, I can't believe I missed that fact

- TuringTest

that doesn't make a difference, you can make four 5's into 26 even though 26 is not divisible by 5
5*5+(5/5)

- anonymous

Oh I see.....

- anonymous

in jimmy's example, he used 7/7 to add 1...

- anonymous

Oh, yeah, then my time HASN't been a complete waste

- anonymous

Good observation...

- anonymous

are parentheses allowed?

- TuringTest

I would think so... it's just multiplication

- anonymous

Yeah

- anonymous

i was thinking maybe there was an order of operations trick to solving it or something... grasping at straws :-)

- shadowfiend

You don't need them though, order of operations takes care of the problem above.

- anonymous

yes - i didn't need the parenthesis

- sandra

It all depends on if digits can be stacked without operations (is 77 valid?) - in which case 7*77+7/7 works as jimmyrep mentioned

- anonymous

question y u no make sense? ლ(ಠ益ಠლ)

- shadowfiend

I feel like concatenation is needed here though. I'm not sure there's another way to grow the number fast enough while reserving 7/7 to make the difference of 1 you need to get to 540 itself.

- wasiqss

this is certainly a crap question because 540 is not divisible by 7 and i advise ppl to stop wastin time on it

- TuringTest

I already pointed out that the fact that 540 is not divisible by 7 makes no difference, read above

- TuringTest

the problem is sitting in meta-math now, so it can be viewed in the future by someone who can figure this out, or prove it to be impossible.

- anonymous

Sooooooo, you can't get a straight answer right?

- TuringTest

not here, not now...

- anonymous

this is correct answer

- anonymous

Bummer huh

- anonymous

Oh, well, guys I don't want to completely waste all your time

- anonymous

So, if everyone please get together with the plan and just randomly give everyone you can medals!

- TuringTest

Like I say, check the meta-math section in the future, someone will probably either find the answer or prove it impossible... eventually.

- anonymous

Thanks, to everyone, for all the help

- anonymous

what an awesome way to waste time

- TuringTest

:)

- anonymous

Well, medals or wasted time right? Might as well

- anonymous

but to prove it impossible without a computers help is going to be interesting

- TuringTest

moneybird has a knack for this kind of thing, but he's not around.

- anonymous

Yep, but it's gonna take a looot of time and luck

- anonymous

Yeah, something about koalas that makes him as smart as he is

- TuringTest

jejeje...

- anonymous

yo

- anonymous

why r ppl still on this question,
u u ppl stil solving it?

- TuringTest

I'm thinking it is impossible:
adding 7/7=1 is the only way I can see to get to a number that is not divisible by 7, which only leaves three 7's left over, and the most we can make that into is
7*7*7=343
taking 540-(7/7)=539
and
539/7=77
hence it seems jimmyrep's answer is the only one possible, but I don't think this is a true proof that it is impossible.

- anonymous

I tried a bunch of different ways, and I can't find an answer. Now I have a Chem Final in 45min., and this problem is all I'll be thinking of!

- anonymous

JIMMY IS CORRECT :P

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