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6÷2(1+2)=? 1 or 9?
Started by ___eXPLOSIVo___, Jun 21 2013 03:31 PM
maths subject boredtimes counting
24 replies to this topic
#1 Posted 21 June 2013  03:31 PM
Hey guys!
I was bored in the game and found this task. Let's test the players of WoT that how they solve this "small problem".
http://imageshack.us...es/89/fdey.jpg/
Good luck =)
I was bored in the game and found this task. Let's test the players of WoT that how they solve this "small problem".
http://imageshack.us...es/89/fdey.jpg/
Good luck =)
#2 Posted 21 June 2013  03:37 PM
number in between the ( ) first makes 6:2(3)
number before the ( is a x to the numbers inside the () makes 6:6=1.
number before the ( is a x to the numbers inside the () makes 6:6=1.
#5 Posted 21 June 2013  03:41 PM
When mathematical sign is missing between a number and bracked, it indicates a multiplication, so the term is the same as:
6 : 2 * (1+2)
Dividing something is the same as multiplication with the reziprok, so the term is the same as:
6 * (1/2) * (1+2)
Now you see the answer is 9!
Another Explanation if you don't believe the first one... Mathematical multiplication and division operators are all LEFT associative (see http://en.wikipedia....i/Associativity). That means, when you have more than one multiplication and/or division in a row, you have to start from the left, so first you have to take 6 : 2 and afterwards the result multiplicated with the brackets. So:
6 : 2 (1+2)
= (6 : 2) * (1+2)
= 3 * 3
= 9
If you want it to be 1 as result, the term at the beginning must be:
6 : ( 2 * (1+2) )
6 : 2 * (1+2)
Dividing something is the same as multiplication with the reziprok, so the term is the same as:
6 * (1/2) * (1+2)
Now you see the answer is 9!
Another Explanation if you don't believe the first one... Mathematical multiplication and division operators are all LEFT associative (see http://en.wikipedia....i/Associativity). That means, when you have more than one multiplication and/or division in a row, you have to start from the left, so first you have to take 6 : 2 and afterwards the result multiplicated with the brackets. So:
6 : 2 (1+2)
= (6 : 2) * (1+2)
= 3 * 3
= 9
If you want it to be 1 as result, the term at the beginning must be:
6 : ( 2 * (1+2) )
Edited by ssgtom, 21 June 2013  03:53 PM.
#7 Posted 21 June 2013  03:50 PM
answer is 9, divide and multiply are mathematical equals so have to be taken in turn. part between brackets is done first.
so it is
6:2*(1+2)=
6:2*3=
6*0.5*3=
9
why all the trouble to remove brackets and then forgetting you have to do so with both in a division.
6/2*(X+Y)=6*0.5*(X+Y)=3*(X+Y)=3X+3Y. in this case 9.
so it is
6:2*(1+2)=
6:2*3=
6*0.5*3=
9
Quote
It can't be neither 1 or 9
1.You beginn with the bracket, so 1*2 and 2*2
2.Then we get this 6/2+4
3.the result is then 7
1.You beginn with the bracket, so 1*2 and 2*2
2.Then we get this 6/2+4
3.the result is then 7
why all the trouble to remove brackets and then forgetting you have to do so with both in a division.
6/2*(X+Y)=6*0.5*(X+Y)=3*(X+Y)=3X+3Y. in this case 9.
Edited by conductiv, 21 June 2013  03:56 PM.
#11 Posted 21 June 2013  04:06 PM
ilosz, on 21 June 2013  03:49 PM, said:
It can't be neither 1 or 9
1.You beginn with the bracket, so 1*2 and 2*2
2.Then we get this 6/2+4
3.the result is then 7
1.You beginn with the bracket, so 1*2 and 2*2
2.Then we get this 6/2+4
3.the result is then 7
Well, I explained the right answer before... I can imagine that some People accidently think it could be 1, which is a mistake easy to do.
But your answer is completely... well wtf???
I just try to figure what you are trying to tell us. I guess you tried to solve the last part of the term
... 2 * ( 1+2)
and you rewrote it as
... 2 * 1 + 2 * 2
but how the hell do you get 4 out of this???
... 2 * 1 + 2 * 2
= 2 + 4
= 6
Always thought a answer only could be right or wrong, but yours is the wrongest :P
#12 Posted 21 June 2013  04:14 PM
ssgtom, on 21 June 2013  04:06 PM, said:
Well, I explained the right answer before... I can imagine that some People accidently think it could be 1, which is a mistake easy to do.
But your answer is completely... well wtf???
I just try to figure what you are trying to tell us. I guess you tried to solve the last part of the term
... 2 * ( 1+2)
and you rewrote it as
... 2 * 1 + 2 * 2
but how the hell do you get 4 out of this???
... 2 * 1 + 2 * 2
= 2 + 4
= 6
Always thought a answer only could be right or wrong, but yours is the wrongest :P
But your answer is completely... well wtf???
I just try to figure what you are trying to tell us. I guess you tried to solve the last part of the term
... 2 * ( 1+2)
and you rewrote it as
... 2 * 1 + 2 * 2
but how the hell do you get 4 out of this???
... 2 * 1 + 2 * 2
= 2 + 4
= 6
Always thought a answer only could be right or wrong, but yours is the wrongest :P
#13 Posted 21 June 2013  04:22 PM
ssgtom, on 21 June 2013  04:06 PM, said:
Well, I explained the right answer before... I can imagine that some People accidently think it could be 1, which is a mistake easy to do.
But your answer is completely... well wtf???
I just try to figure what you are trying to tell us. I guess you tried to solve the last part of the term
... 2 * ( 1+2)
and you rewrote it as
... 2 * 1 + 2 * 2
but how the hell do you get 4 out of this???
... 2 * 1 + 2 * 2
= 2 + 4
= 6
Always thought a answer only could be right or wrong, but yours is the wrongest :P
But your answer is completely... well wtf???
I just try to figure what you are trying to tell us. I guess you tried to solve the last part of the term
... 2 * ( 1+2)
and you rewrote it as
... 2 * 1 + 2 * 2
but how the hell do you get 4 out of this???
... 2 * 1 + 2 * 2
= 2 + 4
= 6
Always thought a answer only could be right or wrong, but yours is the wrongest :P
na he tried removing brackets.
6/2*(2+1)
removing brackets (the error): 2*1+2*2=2+4
placing back into equation 6/2+4
solve in order, first divide then add up: 6/2+4 = 6/2=3 followed by 3+4=7
while you get 1 by prioritizing * over /.
you also get weird answers by fragmenting the bracket removal (first solving 2*(2+1) as (4+2) with the next step 6/4+6/2=1,5+3=4,5)
there are many errors to be made that can give you complete bullocks answers on simple questions
#14 Posted 21 June 2013  04:33 PM
Simple: You take the brackest first so its
6 / 2 * (1+2) = 6 / 2 * 3
And then you go from lef to right and get
6 / 2 * 3 = 3 * 3= 9
6 / 2 * (1+2) = 6 / 2 * 3
And then you go from lef to right and get
6 / 2 * 3 = 3 * 3= 9
#19 Posted 21 June 2013  06:10 PM
6÷2(1+2)
(6÷2)*((1+2))
(6÷2)*(3)
3*3
OMG! It's full of stars.
(6÷2)*((1+2))
(6÷2)*(3)
3*3
OMG! It's full of stars.
Edited by MeetriX, 21 June 2013  06:10 PM.
#20 Posted 21 June 2013  06:27 PM
Fedajkin1989, on 21 June 2013  05:21 PM, said:
no it's not hard, it's also extremely old and boring
Well, everything is interesting for one time only. And if anything's old then it doesn't mean it's not interesting for those who hadn't seen it before.... Btw don't forget to vote down this post also like you did all what I wrote because you don't like this topic.
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