#1
So I took the first half of my math MCAS (state standardized test in Massachusetts) test today, and I came across this problem. I asked about 5 people, and none of them got it, and my friend didn't get it, and they said that they asked people who also didn't get it. So I was wondering if someone could solve it here, since there are some smart bastards on this forum.

8*15+20/5 = 38
6/3*2

Insert ONE set of parentheses to make the expression true.

* is multiplication, / is division, if that's unclear. And it's a fraction sorta thing.


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#3
8*(15+20/5)
6/3*2

EDIT:

numerator:
8*(15+20/5) = 8*(15+4) = 8*19 = 152
denominator:
6/3*2 = 2*2 = 4

thus, 152/4 = 38
google agrees
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Last edited by paintITblack39 at May 17, 2011,
#4
Quote by cho0onger


8*(15+20/5) = 38
6/3*2


There.
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#5
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I only know math. Not this "maths" you speak of.


How ironic.
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#6
Quote by paintITblack39
8*(15+20/5)
6/3*2

EDIT:

numerator:
8*(15+20/5) = 8*(15+4) = 8*19 = 152
denominator:
6/3*2 = 2*2 = 4

thus, 152/4 = 38
google agrees

In the denominator, don't you do the division before the multiplication? I'm going off PEMDAS, which I learned in 6th grade.


Quote by CoreysMonster

I still like cho0onger more than the 2 of you

Quote by OneHappyCamper
joke's on you, i actually fuck my cat
#9
multiplication is the same thing as division they are interchangeable.
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#10
Quote by cho0onger
In the denominator, don't you do the division before the multiplication? I'm going off PEMDAS, which I learned in 6th grade.

multiplication and division are kind of the same as far as operations go. think about it, division is basically multiplying a number by another number's reciprocal.

16/4 is the same is 16*0.25 (0.25 is the reciprocal of 4).

your teacher should have told you that PEMDAS can also take the form of PEDMAS, PEDMSA, or PEMDSA.
http://en.wikipedia.org/wiki/Order_of_operations
Sent from my iPad.
Last edited by paintITblack39 at May 17, 2011,
#11
Quote by paintITblack39
multiplication and division are kind of the same as far as operations go. think about it, division is basically multiplying a number by another number's reciprocal.

16/4 is the same is 16*0.25 (0.25 is the reciprocal of 4).

your teacher should have told you that PEMDAS can also take the form of PEDMAS, PEDMSA, or PEMDSA.
http://en.wikipedia.org/wiki/Order_of_operations

I'm changing my answer when I get my test back tomorrow. Thanks very much, good sir.


Quote by CoreysMonster

I still like cho0onger more than the 2 of you

Quote by OneHappyCamper
joke's on you, i actually fuck my cat