anonymous
  • anonymous
Using the digit 7 five time, place the basic arithmetic signs in between the digits to obtain a total of 540
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
nice question.....
anonymous
  • anonymous
I know, it's been driving me nuts
anonymous
  • anonymous
can you join two 7s together to form 77?

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More answers

anonymous
  • anonymous
Nah, you gotta put the signs in between each one
anonymous
  • anonymous
You're going crazy, aren't you?
anonymous
  • anonymous
this question is right r u sure?
anonymous
  • anonymous
because if it is not then bad things will happen
anonymous
  • anonymous
Yeth, I'm pretty sure it's the question
anonymous
  • anonymous
And now everyone's thinking...
anonymous
  • anonymous
It would be fast to do with computer code, any one good with programming ?
wasiqss
  • wasiqss
certainly question of the week
anonymous
  • anonymous
yes certainly
TuringTest
  • TuringTest
if it doesn't get solved here put it in the meta-math section for future reference
anonymous
  • anonymous
I've really been trying this for a while and I think it's messed up anyone else think it's impossible?
anonymous
  • anonymous
as in, it's total overload here
anonymous
  • anonymous
i'm not sure if this fits the rules but 77 x 7 + (7 / 7) gives 540
TuringTest
  • TuringTest
+ - / and * only, right? no squaring or anything?
anonymous
  • anonymous
concatenation isn't arithmetic right? nice work jimmyrep btw
anonymous
  • anonymous
jimmyrep, if no one can find a solution without the placing two 7s together, I'll use your solution
anonymous
  • anonymous
ok
anonymous
  • anonymous
i don't think you can do it without joining two 7s together, jimmy rep has the right answer.
anonymous
  • anonymous
77 is probably not allowed
wasiqss
  • wasiqss
jimmy rep yehh 77 not allowd
anonymous
  • 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
  • anonymous
these types of question are obsessive!
anonymous
  • anonymous
Yep
anonymous
  • anonymous
you can't do it because 540 is not divisible by 7.
anonymous
  • anonymous
I KNEW IT! All that time wasted, I COULD'VE BEEN PLAYING TETRIS!
anonymous
  • anonymous
lol
anonymous
  • anonymous
Sweet baby turtles, I can't believe I missed that fact
TuringTest
  • 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
  • anonymous
Oh I see.....
anonymous
  • anonymous
in jimmy's example, he used 7/7 to add 1...
anonymous
  • anonymous
Oh, yeah, then my time HASN't been a complete waste
anonymous
  • anonymous
Good observation...
anonymous
  • anonymous
are parentheses allowed?
TuringTest
  • TuringTest
I would think so... it's just multiplication
anonymous
  • anonymous
Yeah
anonymous
  • anonymous
i was thinking maybe there was an order of operations trick to solving it or something... grasping at straws :-)
shadowfiend
  • shadowfiend
You don't need them though, order of operations takes care of the problem above.
anonymous
  • anonymous
yes - i didn't need the parenthesis
sandra
  • 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
  • anonymous
question y u no make sense? ლ(ಠ益ಠლ)
shadowfiend
  • 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
  • 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
  • TuringTest
I already pointed out that the fact that 540 is not divisible by 7 makes no difference, read above
TuringTest
  • 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
  • anonymous
Sooooooo, you can't get a straight answer right?
TuringTest
  • TuringTest
not here, not now...
anonymous
  • anonymous
this is correct answer
anonymous
  • anonymous
Bummer huh
anonymous
  • anonymous
Oh, well, guys I don't want to completely waste all your time
anonymous
  • anonymous
So, if everyone please get together with the plan and just randomly give everyone you can medals!
TuringTest
  • 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
  • anonymous
Thanks, to everyone, for all the help
anonymous
  • anonymous
what an awesome way to waste time
TuringTest
  • TuringTest
:)
anonymous
  • anonymous
Well, medals or wasted time right? Might as well
anonymous
  • anonymous
but to prove it impossible without a computers help is going to be interesting
TuringTest
  • TuringTest
moneybird has a knack for this kind of thing, but he's not around.
anonymous
  • anonymous
Yep, but it's gonna take a looot of time and luck
anonymous
  • anonymous
Yeah, something about koalas that makes him as smart as he is
TuringTest
  • TuringTest
jejeje...
anonymous
  • anonymous
yo
anonymous
  • anonymous
why r ppl still on this question, u u ppl stil solving it?
TuringTest
  • 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
  • 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
  • anonymous
JIMMY IS CORRECT :P

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