LOGIN  .  SIGNUP   .  SUPPORT 
HOME / MESSAGE BOARDS / GENERAL DISCUSSIONS

General Discussions

Signup   Message Boards Home   Newest Posts   My Favorite Boards   My Threads
Page 9 of 10   •  First Page  •  Previous Page  •   Next Page  •   Last Page
Signup or Login to Post
POLL: A simple mathematical problerm
 
forty-two  posted on Apr 15, 2011 5:49:30 AM - Report post

Moderator
Send a message to forty-two
MODERATOR
Treat the (3+12) as X
48/2(X)

Now, read it out loud.
Did you say "48 divided by 2X" or "48 divided by 2 times X"?
48 divided by 2X results in 2. 48 divided by 2, times X results in 288. It's all about how you read it, there is no correct answer because it is written wrong.

 
Paper_Masochist  posted on Apr 15, 2011 5:52:03 AM - Report post

Current rank: 1 Star. Next Rank at 100 Posts.
Send a message to Paper_Masochist
ELITE
Both answers are right because the syntax is ambiguous. Rules of mathematics don't account for ambiguous syntax.

Edit: My first post and I was ninja'd. Hah, ouch. =)

[Edited by Paper_Masochist, 4/15/2011 5:57:03 AM]

 
latios_power  posted on Apr 15, 2011 6:08:33 AM - Report post

Current rank: 3.5 Stars. Next Rank at 8000 Posts.
Send a message to latios_power
ELITE
quote:
originally posted by forty-two

Treat the (3+12) as X
48/2(X)

Now, read it out loud.
Did you say "48 divided by 2X" or "48 divided by 2 times X"?
48 divided by 2X results in 2. 48 divided by 2, times X results in 288. It's all about how you read it, there is no correct answer because it is written wrong.

Yeah it depends on how you read it, But tell Neo this because he said that we can't say both answer are right, it's "mathematically" wrong.
Y U NO TELL US THE ANSWER

 
Vegetta  posted on Apr 16, 2011 12:03:00 AM - Report post

Current rank: 3 Stars. Next Rank at 4000 Posts.
Send a message to Vegetta
AUTHOR
@Latios_power
I am sure that scientific calculators do not know what even means "order of operations". .
Think the problem like this:
48/2(9+3)=
48/2*18=
48*0.5*18=
288
Do i have something wrong?
Division is an inverse multiplication, is it?

 
Paper_Masochist  posted on Apr 17, 2011 3:03:36 AM - Report post

Current rank: 1 Star. Next Rank at 100 Posts.
Send a message to Paper_Masochist
ELITE
quote:
originally posted by Vegetta

@Latios_power
I am sure that scientific calculators do not know what even means "order of operations". .
Think the problem like this:
48/2(9+3)=
48/2*18=
48*0.5*18=
288
Do i have something wrong?
Division is an inverse multiplication, is it?

You're perfectly correct (aside from the 18), however the confusion here is with the brackets.

In my country, and apparently plenty of others, when we have a number like 2(9+3) we do something called expand the brackets*. So to people in Australia/other countries the sum would be understood as:

48/(2x(9+3))
=2

Which is why I feel so smug right now, as your syntax for the sum I interpreted is ugly, meanwhile our syntax for the way you interpret it:

48/2x(9+3)

Is fine.

*www.teacherschoice.com.au/maths_library/algebra/alg_2.htm

[Edited by Paper_Masochist, 4/17/2011 3:04:04 AM]

 
Neo7  posted on Apr 28, 2011 9:03:44 AM - Report post

Moderator
Send a message to Neo7
MODERATOR
Back to this again.

I asked my mathematics professor (Ph.D. in mathematics). He says the answer is 288 becaues the divisor of the division problem is always the length of one real number unless specificed by a sub-equation completely encased in parenthesis/brackets (with the open parenthesis/bracket occuring immediately after the division symbol).

48/2(3+9) = 288
48/[2(3+9)] = 2

 
yacker  posted on Apr 28, 2011 10:22:10 AM - Report post

Current rank: 1 Star. Next Rank at 100 Posts.
Send a message to yacker
ELITE
BODMAS, I remember from school in the 80`s
 
64  posted on Apr 28, 2011 2:20:17 PM - Report post

Current rank: 1.5 Stars. Next Rank at 500 Posts.
Send a message to 64
CHEATMASTER
48/2(9+3)=
48/2(12)=
48/2*12=
48/24=
2
Page 9 of 10   •  First Page  •  Previous Page  •   Next Page  •   Last Page
  Post Reply
Go to page: 1  2  3  4  5  6  7  8  9  10 
All times are (GMT -06:00) Central Time (US & Canada). Current time is 6:27:18 PM