Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.

5 + 5 + 5 - 5 + 5 + 5 - 5 + 5 x 0 = ?


  • Total voters
    264
Did anyone else read that as all addition the first time they saw it? @_@

Anyway, I'd assume 15.
 
15 I think. Most will say 0 because of the multiplication by zero but I think it goes:
5+5+5-5+5+5-5+(5*0)= and that is 15.
 
-5

5+5+5-5+5+5-5+5*0

PMDAS order of operations, Parentheses, Multiplication, Division, Addition, Subtraction

Grouping terms according to order of operations reduces to

(5+5+5)-(5+5+5)-[5+(5*0)]
=15-15-5+0
=-5

Probably wrong, and probably another one of these useless puzzles where everyone is wrong usually on accounta the way it's entered into the computer in type format and not common sense format...pretty sure the last time one of these came up the guy did a bogus job of entering it into the computer

Or, alternatively,

(5+5)+(5-5)+(5+5)-5+0
=15

But that is arbitrary term grouping where you are selecting which operation signs to put in or outside of the parentheses, which is no good.
 
Last edited:
Damn delexia after I put my vote in I saw I was reading one of the 5 twice and was getting it crossed. It should be 15.
 
-5

5+5+5-5+5+5-5+5*0

PMDAS order of operations, Parentheses, Multiplication, Division, Addition, Subtraction

Grouping terms according to order of operations reduces to

(5+5+5)-(5+5+5)-[5+(5*0)]
=15-15-5+0
=-5

Probably wrong, and probably another one of these useless puzzles where everyone is wrong usually on accounta the way it's entered into the computer in type format and not common sense format...pretty sure the last time one of these came up the guy did a bogus job of entering it into the computer

Or, alternatively,

(5+5)+(5-5)+(5+5)-5+0
=15

But that is arbitrary term grouping where you are selecting which operation signs to put in or outside of the parentheses, which is no good.

Wrong, because YOU put in parentheses.
And multiplication=division and addition=subtraction...neither is done first. You do these from left to right.
 
-5

5+5+5-5+5+5-5+5*0

PMDAS order of operations, Parentheses, Multiplication, Division, Addition, Subtraction

Grouping terms according to order of operations reduces to

(5+5+5)-(5+5+5)-[5+(5*0)]
=15-15-5+0
=-5

Probably wrong, and probably another one of these useless puzzles where everyone is wrong usually on accounta the way it's entered into the computer in type format and not common sense format...pretty sure the last time one of these came up the guy did a bogus job of entering it into the computer

Or, alternatively,

(5+5)+(5-5)+(5+5)-5+0
=15

But that is arbitrary term grouping where you are selecting which operation signs to put in or outside of the parentheses, which is no good.

That is incorrect. You do not put () in at all in this case as () fundamentally changes the oder of operations. Addition and Subtraction are the same. Neither takes precedence over the other. Same with Mult and Division. As such, you merely go Left to Right with those operations

The reason addition and subtraction are the same is because adding -5 is the same as subtracting 5 for instance. Same logic for mult and division
 
I voted 15 because that makes sense using PEMDAS and working left to right. Does left to right come into play with calculations? I don't know, grade school math was so long ago. However, puma1552's post below makes sense as well depending upon how you apply PEMDAS if it's not left to right. I don't remember the rule.


-5

5+5+5-5+5+5-5+5*0

PMDAS order of operations, Parentheses, Multiplication, Division, Addition, Subtraction

Grouping terms according to order of operations reduces to

(5+5+5)-(5+5+5)-[5+(5*0)]
=15-15-5+0
=-5

Probably wrong, and probably another one of these useless puzzles where everyone is wrong usually on accounta the way it's entered into the computer in type format and not common sense format...pretty sure the last time one of these came up the guy did a bogus job of entering it into the computer
 
Thanks duke, been a long time...had I seen it scribbled on paper I would've went left to right, but since it's on the computer you always assume it's a setup/trick and not as easy as it would otherwise look.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.