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Most users ever online was 172 on Fri 19 Feb 2016, 05:17

This Math Problem Will Make You Question Everything You Ever Knew About Algebra

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Valoish
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PostValoish on Sun 27 Nov 2016, 12:22

So this problem has gone viral in Japan, after a study discovered that only 60 percent of 20-somethings could actually solve it. Now it's on the news and social media. Let's see who knows their math c;

Tbh I don't understand why this is so hard? ; A; RIP Japan.. They're meant to have the toughest schooling system what even.

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PostSLGray on Sun 27 Nov 2016, 14:01

Is it 7?
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PostValoish on Sun 27 Nov 2016, 16:38

@SLGray Nopeee try again~ :B

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PostSLGray on Sun 27 Nov 2016, 18:32

1

9 - 3 / 1/3 + 1 =
9 - 3 x 3/1 + 1 =
9 - 9 + 1 =
0 + 1 = 1
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PostGuest on Mon 28 Nov 2016, 03:39

Cute. Even I knew the answer to that one Laughing





Right! So, I just made this one up myself (so help me God because there are so many planes taking off today again I couldn't think of anything else but those 747s and that delicious savory pie I just made Razz . Owww... how rude of me... Anyone?):



((((SQRT(74^7) / (1/4 / 16 x pi^pi)) / (74.7 x 4/16) - pi) + (7 x SQRT(7-47^7^4)^7)) x 0^7.47 = ? >> And... why? <<


HINT: If your calculator keeps resetting the equation all the time, get yourself an improved version or just start over again until you get it (or get hit by it) lol!



I bet SLGray & Ange know. It's too simple for words! HAHA! XD Smile


Last edited by Samantha NL on Mon 28 Nov 2016, 17:13; edited 2 times in total
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PostValoish on Mon 28 Nov 2016, 12:58

@SLGray You got it~ c: 
@Samantha NL Damn okay. Once I have my TI-84 or TI-89 I'll give it a go Razz

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PostGuest on Mon 28 Nov 2016, 13:29

@Valoish wrote:@Samantha NL Damn okay. Once I have my TI-84 or TI-89 I'll give it a go Razz

scratch lol!
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PostParadiseng on Mon 28 Nov 2016, 16:33

The Answer is -1

9 - 3 ÷ 1/3 + 1 = ?
Rule of Bodmas
so we take up the division sign first.

9 - 3 x 3/1 + 1 = ?
9 - 9/1 + 1 = ?

Note that 9/1 = 9

therefore,
9 - 9 + 1 =?

Now, we take up the Addition sign according to BODMAS

9 - 10 = ?
Answer = -1
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PostGuest on Mon 28 Nov 2016, 16:41

@Paradiseng wrote:The Answer is -1

9 - 3 ÷ 1/3 + 1 = ?
Rule of Bodmas
so we take up the division sign first.

9 - 3 x 3/1 + 1 = ?
9 - 9/1 + 1 = ?

Note that 9/1 = 9

therefore,
9 - 9 + 1 =?

Now, we take up the Addition sign according to BODMAS

9 - 10 = ?
Answer = -1

Nope. Wrong answer for both Valoish's equation as for mine.
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PostSLGray on Mon 28 Nov 2016, 16:48

In Algebra, you use order of operations with equations.
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PostWolfuryo on Mon 28 Nov 2016, 17:14

9-3:(1/3)+1=9-3*3+1=9-9+1=1
Super easy Smile)
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PostGuest on Mon 28 Nov 2016, 17:14

Andrei34 wrote:9-3:(1/3)+1=9-3*3+1=9-9+1=1
Super easy Smile)

Indeed. Now the other equation, which is even more simple Laughing http://fmdesign.forumotion.com/t1142-this-math-problem-will-make-you-question-everything-you-ever-knew-about-algebra#27134


If you're still chewing on that, here's another one for you:

What I think - Facts = ?
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PostGuest on Tue 29 Nov 2016, 07:23

Right. I believe nobody cares about my posts somehow. So here are the answers...

What I think - Facts = Denial
Laughing



((((SQRT(74^7) / (1/4 / 16 x pi^pi)) / (74.7 x 4/16) - pi) + (7 x SQRT(7-47^7^4)^7)) x 0^7.47 = ?



Well... here it is: ? = 0


Why? Doesn't matter what it says. Everything multiplied by 0, like the (((((SQRT(74^7) / (1/4 / 16 x pi^pi)) / (74.7 x 4/16) - pi) + (7 x SQRT(7-47^7^4)^7)) x 0^7.47 = ?

equals 0. Since the equation is in brackets everything applies to 0, even the ^7.47 (0x0x0x0x0x0x0x.47) = 0. Hence, 0 x 1/4 of or 2,000,000 times 0 a pie is still nothing! 0 x 5 seats reservated in a 747 = no seats reservated at all. 0 flights out of 1,107 leaving Amsterdam Schiphol Airport each day = 0 flights taking off that day from Amsterdam.


Saved my day once in school and it'll save yours one day I'm sure, so please remember to always read over the equeation (twice?) first before replying to it! Something x 0 = 0, remember! You won't be needing sophisicated programs or calculators to solve it once you know and understand! lol!
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PostPantone on Tue 29 Nov 2016, 11:02

Came up with 9 and 7, first.

Then the "hey isn't it something to do with dividing that fraction?" lightbulb
came on. I was in a hurry to solve it.

I'm going to guess.
-1.


PEMDAS

I. When you divide w/ a fraction, you turn the second fraction upside down & multiply. (Assuming I multiply straight across.)

3/1 x 3/1 = 3/1 = 9


II. Add things together.

9 + 1 = 10


III. Subtract.

9 - 10 =-1


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PostValoish on Tue 29 Nov 2016, 11:09

Close.
9 - 3 / (1 / 3) + 1 
9 - 3 × 3 + 1
9 - 9 + 1
Following PEMDAS, 
9 - 9 = 0 + 1 = 1

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PostPantone on Tue 29 Nov 2016, 11:38

OHHHHHHH YEP!
Gdi.

In the "9-3x3+1":
Would the "3x3" come out of flipping those fractions?

How did we get to 3x3? T_T

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PostParadiseng on Fri 02 Dec 2016, 13:18

@SLGray wrote:In Algebra, you use order of operations with equations.
learnt something new today thanks
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PostValoish on Fri 02 Dec 2016, 13:23

@HaeDoesGraphics
HaeDoesGraphics wrote:OHHHHHHH YEP!
Gdi.

In the "9-3x3+1":
Would the "3x3" come out of flipping those fractions?

How did we get to 3x3? T_T
Yeah c: My teacher called it "Keep, change, flip". So basically you keep the first number, change the sign/operation to the opposite of what it currently is, and then flip over the fraction :B

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PostAce 1 on Fri 02 Dec 2016, 13:59

- On the logical side:

⅓ goes into 3 nine times evenly.


- Also, to clarify Waloish's teacher's trick:

If you divide by any number, it's the same as multiplying by the reciprocal of said number [the reciprocal is the number with a one over it (with fractions the numerator is switched with the denominator)].

Dividing by ⅓ is the same as multiplying by 3.



So this would be 9.

Dividing by ½ is the same as multiplying by 2.



So this would be 6.


I hope those helped a bit.
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PostPantone on Fri 02 Dec 2016, 14:09

I feel so stupid. I had that at one point, but thought I did the flip thing wrong.

It's been at least 3 years. LOL.

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PostAce 1 on Fri 02 Dec 2016, 14:30

lol you're good. I haven't spoken French in like 1-2 years and I tried to talk to someone and I couldn't flow like I used to. Time does make you forget a lot.
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PostSLGray on Fri 02 Dec 2016, 16:28

When you divide factions, you have to invert the second one and multiply.

1/2 divide by 3/10 =
1/2 x 10/3 =
1/1 x 5/3 =
5/3 (1 2/5)

1/3 divided by 9 =
1/3 divided by 9/1 =
1/3 x 1/9 =
1/27
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PostCeluna on Wed 07 Dec 2016, 13:54

Hello,

In fact it is necessary to make an "inverse multiplication". So multiply 3 by the denominator which also 3. Let (9-3 × 3 + 1). Therefore, it is enough to multiply the numerators and the denominators in order to make the fraction simpler. So (3 × 3/1), which is equal to 9. So we just have to calculate the whole: 9-9 + 1 = 1.
This is a 4th grade level in high school in France. I still remember my super mathematics teacher who was really great and he knew how to teach us mathematics with great ease.

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