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Message
Math Experts: GMAT Help
Posted on 7/15/16 at 2:29 pm
Posted on 7/15/16 at 2:29 pm
So I'm using this GMAT prep software to get ready for the GMAT in a couple weeks. I'm having trouble interpreting what they mean by sufficient. I don't so much need help with this specific question but moreso with the entire interpretation of the term sufficient as I don't want to interpreting their line of questioning in the wrong way. The question states:
Does 2m - 3n = 0?
1) m /= 0
2) 6m = 9n
There are then 5 options of:
A. Equation 1 alone is sufficient
B. Equation 2 alone is sufficient
C. Both equations are sufficient alone
D. Equations are sufficient but only together
E. Neither equation is sufficient, even if they're together
When I think of sufficient I think of an adequate equation to solve the initial question. The variable m not being equal to zero obviously does nothing for me to solve the original question so Equation 1 is out. Then when I look at Equation 2, it's just a reordering of the original question. It's not a new independent equation so I'm still left with one independent equation and two variables.
So I hit E and said neither were sufficient. There's no way if you give me Equation 2 that I can tell you definitively what n and m are. They, however, are saying Equation 2 is sufficient. They're exact wording is:
Since 6m = 9n is equivalent to 3(2m) = 3(3n), it can therefore be determined that 2m = 3n; SUFFICIENT
What in the frick does that explanation even mean? I was always pretty good at math and can't figure out what in the hell this question is asking for if that is the answer. Really appreciate any help
TIA!
Does 2m - 3n = 0?
1) m /= 0
2) 6m = 9n
There are then 5 options of:
A. Equation 1 alone is sufficient
B. Equation 2 alone is sufficient
C. Both equations are sufficient alone
D. Equations are sufficient but only together
E. Neither equation is sufficient, even if they're together
When I think of sufficient I think of an adequate equation to solve the initial question. The variable m not being equal to zero obviously does nothing for me to solve the original question so Equation 1 is out. Then when I look at Equation 2, it's just a reordering of the original question. It's not a new independent equation so I'm still left with one independent equation and two variables.
So I hit E and said neither were sufficient. There's no way if you give me Equation 2 that I can tell you definitively what n and m are. They, however, are saying Equation 2 is sufficient. They're exact wording is:
Since 6m = 9n is equivalent to 3(2m) = 3(3n), it can therefore be determined that 2m = 3n; SUFFICIENT
What in the frick does that explanation even mean? I was always pretty good at math and can't figure out what in the hell this question is asking for if that is the answer. Really appreciate any help
TIA!
18
Posted on 7/15/16 at 2:31 pm to FootballNostradamus
m = 288
N = 350
N = 350
Posted on 7/15/16 at 2:34 pm to FootballNostradamus
Equation 2 appears to be sufficient enough by itself
Edit:
Solve equation 2 for n and plug into the original equation, which allows you to solve for m and ultimately n as well
Edit:
Solve equation 2 for n and plug into the original equation, which allows you to solve for m and ultimately n as well
This post was edited on 7/15/16 at 2:37 pm
Posted on 7/15/16 at 2:34 pm to FootballNostradamus
m = 9
n = 6
ETA : I grow grass for a living. Get your shite together, son.
n = 6
ETA : I grow grass for a living. Get your shite together, son.
This post was edited on 7/15/16 at 2:35 pm
Posted on 7/15/16 at 2:35 pm to FootballNostradamus
You don't have to know the exact values m and n are to know that 2m - 3n = 0, when you are given that 6m = 9n.
Therefore, equation 2 is sufficient to determine that 2m - 3n = 0.
Therefore, equation 2 is sufficient to determine that 2m - 3n = 0.
Posted on 7/15/16 at 2:35 pm to FootballNostradamus
My man, if you have still trying to grasp data sufficiency and you're a few weeks from your GMAT, you need to delay it ASAP.
Sufficiency is simply "Is there enough information here to come up with a unique solution to the problem"
2+2=4 is sufficient. The answer is correct and there is 1 unique answer to this problem.
2+2=5 is sufficient. The answer to this problem is always "no".
Get an account at GMAT club LINK and start going through the quant forums. There is tons of good stuff on there.
Sufficiency is simply "Is there enough information here to come up with a unique solution to the problem"
2+2=4 is sufficient. The answer is correct and there is 1 unique answer to this problem.
2+2=5 is sufficient. The answer to this problem is always "no".
Get an account at GMAT club LINK and start going through the quant forums. There is tons of good stuff on there.
Posted on 7/15/16 at 2:36 pm to FootballNostradamus
quote:
Does 2m - 3n = 0?
Move 3n to the other side so 2m = 3n
quote:
6m = 9n
Separate out lowest common denominator (3) so equation becomes 3 (2m) = 3 (3n). Divide by 3 and 2m= 3n
Posted on 7/15/16 at 2:36 pm to ksayetiger
I have never heard of this "sufficient equation" you speak of
Posted on 7/15/16 at 2:37 pm to Azazello
What he said. Those types of questions are all over the math section. GMAT prep material shows ou how to immediately eliminate 2 or 3 if the answers if I remember correctly.
This post was edited on 7/15/16 at 2:39 pm
Posted on 7/15/16 at 2:42 pm to steakbombLSU
Yup. You look at it like this
AC
BDE
or
BC
ADE
AC
BDE
or
BC
ADE
Posted on 7/15/16 at 2:42 pm to FootballNostradamus
You really asked us about this child problem? You sure you're cut out for grad school?
m = 9 n = 6
m = 9 n = 6
Posted on 7/15/16 at 2:42 pm to FootballNostradamus
(no message)
This post was edited on 7/15/16 at 2:44 pm
Posted on 7/15/16 at 2:51 pm to FootballNostradamus
2m = 3n
therefore 2m-3n = 0
I didn't read the thread. if you see that A = B then A-B = 0
2 is sufficient
therefore 2m-3n = 0
I didn't read the thread. if you see that A = B then A-B = 0
2 is sufficient
This post was edited on 7/15/16 at 2:52 pm
Posted on 7/15/16 at 2:53 pm to Breauxsif
quote:
You sure you're cut out for grad school?
the GMAT will let him know.
he seems earnest. if you do the work, even ordinary people can excel.
maybe he doesnt get to party for the next 24 months. if he is willing to do the work, anything is possible. TD and Wolfram Alpha will be there for him.
He will sit next to an ugly girl and befriend her.
This post was edited on 7/15/16 at 2:55 pm
Posted on 7/15/16 at 2:56 pm to CelticDog
It took me 4 attempts and about 8 months of studying to finish the GMAT. God Awful experience
Posted on 7/15/16 at 2:57 pm to Breauxsif
quote:
You really asked us about this child problem? You sure you're cut out for grad school?
m = 9 n = 6
You don't understand the question and therefore are not in a position to make fun of him for not understanding it.
BTW m = 9 n = 6 is not the correct solution.
Posted on 7/15/16 at 3:05 pm to Breauxsif
quote:
You really asked us about this child problem? You sure you're cut out for grad school?
m = 9 n = 6
Lol, God help us, hope you never graduated high school.
Posted on 7/15/16 at 3:09 pm to CelticDog
quote:
I didn't read the thread. if you see that A = B then A-B = 0
2 is sufficient
This and recognizing that the ratios of the coefficients are the same in the two equations are the keys to this problem.
Posted on 7/15/16 at 3:09 pm to FutureMikeVIII
quote:
You don't have to know the exact values m and n are to know that 2m - 3n = 0, when you are given that 6m = 9n.
Therefore, equation 2 is sufficient to determine that 2m - 3n = 0.
So I'm just way overthinking this apparently.
At the most basic sense, sure I understand that if you're trying to prove that an equation stating 2m - 3n = 0 exists then if I give you 6m = 9n you can modify and turn that into the above equation.
That's just a super weird question that makes no sense to me. Who asks if a hypothetical equation exists and if another equation is sufficient to equal that?
When I think of something as being sufficient I think of it as being sufficient enough to solve the initial equation. I still don't have anywhere near enough information to solve the initial equation but I can modify their given equation to equal the original equation.
This is the feedback I was looking for, though. If they're just looking for me to modify a given equation into an original equation, that's beyond easy.
Posted on 7/15/16 at 3:13 pm to FootballNostradamus
quote:
FootballNostradamus
I don't want to type out a novel on here but I highly recommend you read the chapter on data sufficiency from the OG. It spells it out word for word exactly what you're looking for.
GMAT prep now also has some good intro videos. Check this one out LINK
Finally, remember that the GMAT is not a math test or a verbal test. It is a problem solving/critical thinking exam. The math is pretty easy and so is the verbal, it's the way they disguise the problems that really screws with you.
This post was edited on 7/15/16 at 3:15 pm
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