48÷2(9+3) = ??

NO ^^^ that equation is just nuts!

NickF40 wrote: I thought, at least I remember, when you have both multiplication and a divide next to each other, it's just whichever ones first, disregarding the PEMDAS for that moment??

This is because multiplication and division are really the same thing.

"M" and "D" are interchangeable, as is "A" and "S."

Parantheses serve the same function as "x," but have an effect on importance in terms of order solved as i was taught. (And apparently 50% of the population. )

So the question is, is ÷ = / ?

Brotus7 wrote: So the question is, is ÷ = / ?

Could be. If so, the answer is 2.

Ben, exactly

Ok, time to end all this, I live up the street from my high school math teacher, (dead serious) he was number one surprised I stopped by lol and 2 that i had a legit question

The answer is.....288 he said what most are getting wrong is that when you have multiplication and division in line with each other, PEMDAS can turn into PEDMSA. He understands the confusion because the way you deal with the 12.

It's not really a multiplication vs. division problem, though.

It's whether or not 2(12) = 2x12 for the purposes of this equation.

Does your brain hurt yet?

NickF40 wrote: Ben, exactly Ok, time to end all this, I live up the street from my high school math teacher,

Man, you don't berkeley around! Amazed that I got anything to do wtih math right. Or at least right enough to satisfy a high school math teacher. I even explained my answer!

(12) or 12 it doesn't matter and you still deal with the 48/2 first.

Damn you Ben, i'm trying to not relive all this! Yeah, i'm one of the few kids of today that actually TOOK and LEARNED something from school lol

NickF40 wrote: (12) or 12 it doesn't matter and you still deal with the 48/2 first. Damn you Ben, i'm trying to not relive all this! Yeah, i'm one of the few kids of today that actually TOOK and LEARNED something from school lol

48
-------- = X
2(9+3)

Solve for X.

Same equation.

42

whatever you want it to be...my brain says screw this 2 12, 2 x 12, 2(12) are all the same

slefain wrote: 42

Damn. You win.

You really know where your towel is.

So the real answer here is about the importance of clear writing, even when it's math.

Is it an actual problem? If so, you can probably go back to the source and figure out which was meant in terms of how the problem is built, or sanity-check the answer (if you're actually trying to calculate something, either 2 or 288 is probably going to be obviously bonkers)

If it's not an actual problem, then there is no problem, and we can all just remember this the next time we're writing out a problem that actually needs to be solved

Coming clean, muddled memories and intuition would've made my guess 2 if I hadn't read thread, due to thinking of the x(y) as multiplication, and a literal multiplication-before-division urge.

OK, I said 288 as well, does that mean I'm stoopid? Never was good at math...

Lesley wrote: OK, I said 288 as well, does that mean I'm stoopid? Never was good at math...

Not stupid, just a girl. :)

<<Math major

1. As it has been mentioned above, multiplication and division are the same thing and are interchangeable. You do them in the order that they appear.

48÷2(9+3)
=48÷2(12)
=(48÷2)(12) <------- Whichever one comes first, remember.
=(24)(12)
=288

Now, for a little more fun: What is 9 3 + 48 2 ÷ *?

paste 48 / 2(9+3) into Google and it says:

(48 / 2) * (9 + 3) = 288

Is there anything it can't do?

Google sees parantheses as "x" signs, though. It's smart enough to solve what's within them first... and that's about it. In my opinion, of course.

mtn wrote: <<Math major 288. As it has been mentioned above, multiplication and division are the same thing and are interchangeable. You do them in the order that they appear. 48÷2(9+3) =48÷2(12) =(48÷2)(12) <------- Whichever one comes first, remember. =(24)(12) =288 Now, for a little more fun: What is 9 3 + 48 2 ÷ *?

=(48÷2)(12)

Why can you do that instead of =48÷(2(12))?

Am i wrong in saying that the way the original equation was written you could interpret it as the following?

48
-------- = X
2(9+3)

Solve for X.

Or... look at it as "2" was factored out of (9+3)?

92CelicaHalfTrac wrote: 48 -------- = X 2(9+3) Solve for X. Same equation.

Nope, not the same equation. You should not be dividing by the (9+3).

Brotus7 wrote: Now, let's kick it up a notch.

=Miata

Brotus7 wrote: Now, let's kick it up a notch.

Does this have to do with heat transfer?

mtn wrote:

92CelicaHalfTrac wrote: 48 -------- = X 2(9+3) Solve for X. Same equation.

Nope, not the same equation. You should not be dividing by the (9+3).

Why's that? Isn't 2(9+3) one number?

I agree that if it was written 2 x (9+3) i couldn't do that... but it's not written that way.

92CelicaHalfTrac wrote:

mtn wrote: <<Math major 288. As it has been mentioned above, multiplication and division are the same thing and are interchangeable. You do them in the order that they appear. 48÷2(9+3) =48÷2(12) =(48÷2)(12) <------- Whichever one comes first, remember. =(24)(12) =288 Now, for a little more fun: What is 9 3 + 48 2 ÷ *?

=(48÷2)(12) Why can you do that instead of =48÷(2(12))? Am i wrong in saying that the way the original equation was written you could interpret it as the following? 48 -------- = X 2(9+3) Solve for X. Or... look at it as "2" was factored out of (9+3)?

It is simply a poorly written equation, but you have to do order of operations. Remember (as has been mentioned above) that multiplication and division happen in the order they appear in the problem.

So if you do 48÷(2(12)), you are not doing them in the order they appear.

92CelicaHalfTrac wrote: Why's that? Isn't 2(9+3) one number? I agree that if it was written 2 x (9+3) i couldn't do that... but it's not written that way.

When written alone, yes it is one number. But so is 48/2.

And yes it IS written as 2 x (9+3), which is where a lot of the confusion comes in.