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gmatiscoming
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if a=2b^3/c what happens to c when a is halved and b is 26 May 2007, 15:52
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if a=2b^3/c what happens to c when a is halved and b is doubled?

a - c is not changed
b- c is halved
c- c is doubled
d- c is multiplied by 4
e - c is multipled by 16





can someone walk me through this problem step by step (without plugging in)
i botched it somewheres



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LM
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if a=2b^3/c what happens to c when a is halved and b is 26 May 2007, 18:32
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gmatiscoming
if a=2b^3/c what happens to c when a is halved and b is doubled?

a - c is not changed
b- c is halved
c- c is doubled
d- c is multiplied by 4
e - c is multipled by 16





can someone walk me through this problem step by step (without plugging in)
i botched it somewheres
Show more


Initially take any value which meets the given equation, for example;

b = 1,

c = 3

thus a = 2.

Next, halve the a = 1 and double the b = 2, put them in the equation and you will see in order to satisfy the equation, the value of c has to be consistently = 3.

Thus value of c remans unchanged.

These are fairly easy questions which you have posted? When is your GMAT date?
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Hayabusa
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if a=2b^3/c what happens to c when a is halved and b is 26 May 2007, 19:09
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LM, are you sure about that?? I think the answer is E.
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LM
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if a=2b^3/c what happens to c when a is halved and b is 26 May 2007, 19:13
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LM, are you sure about that?? I think the answer is E.
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Could you please explain why is it E? I did not follow any mathematical approach for this one, may be I am wrong..I was just putting in the values to get the answer.
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if a=2b^3/c what happens to c when a is halved and b is 26 May 2007, 19:21
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Well I might be wrong, but here is what I did:

a=2b^3/c , solve for c an we get c=2b^3/a. Lets plug for a=4 and b=5
We get c=62.5

Now lets double b and divide a by 2, we get a=2 and b=10. Plug in and we get 1000 which is 62.5 times 16.
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if a=2b^3/c what happens to c when a is halved and b is 26 May 2007, 19:50
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gmatiscoming
if a=2b^3/c what happens to c when a is halved and b is doubled?

a - c is not changed
b- c is halved
c- c is doubled
d- c is multiplied by 4
e - c is multipled by 16

can someone walk me through this problem step by step (without plugging in)
i botched it somewheres
Show more


I believe a=2b^3/c is a = (2b^3) / c

if so, it should be E.

a = (2b^3) / c
c = (2b^3) / a

if a is halved and b is doubled
a/2 = [2(2b)^3] / c
c = [2x 2 x 8b^3] / a
c = (32b^3) / a

so C should be multiplied by 16.
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if a=2b^3/c what happens to c when a is halved and b is 27 May 2007, 02:35
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LM


Initially take any value which meets the given equation, for example;

b = 1,

c = 3

thus a = 2.

Next, halve the a = 1 and double the b = 2, put them in the equation and you will see in order to satisfy the equation, the value of c has to be consistently = 3.

Thus value of c remans unchanged.

These are fairly easy questions which you have posted? When is your GMAT date?
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The ans is E not A!! :roll:
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if a=2b^3/c what happens to c when a is halved and b is 27 May 2007, 02:39
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gmatiscoming
if a=2b^3/c what happens to c when a is halved and b is doubled?

a - c is not changed
b- c is halved
c- c is doubled
d- c is multiplied by 4
e - c is multipled by 16





can someone walk me through this problem step by step (without plugging in)

i botched it somewheres
Show more



(E) certainly :)
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if a=2b^3/c what happens to c when a is halved and b is 27 May 2007, 08:48
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LM
gmatiscoming
if a=2b^3/c what happens to c when a is halved and b is doubled?

a - c is not changed
b- c is halved
c- c is doubled
d- c is multiplied by 4
e - c is multipled by 16





can someone walk me through this problem step by step (without plugging in)
i botched it somewheres

Initially take any value which meets the given equation, for example;

b = 1,

c = 3

thus a = 2.

Next, halve the a = 1 and double the b = 2, put them in the equation and you will see in order to satisfy the equation, the value of c has to be consistently = 3.

Thus value of c remans unchanged.

These are fairly easy questions which you have posted? When is your GMAT date?
Show more


hey LM,

thanks for your smart ass comment, btw. just in case you didn't know you got the answer wrong too... the OA is E. so when is your GMAT date? you f$%! keep your snide remarks to yourself
tool.
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if a=2b^3/c what happens to c when a is halved and b is 27 May 2007, 09:36
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gmatiscoming
if a=2b^3/c what happens to c when a is halved and b is doubled?

a - c is not changed
b- c is halved
c- c is doubled
d- c is multiplied by 4
e - c is multipled by 16





can someone walk me through this problem step by step (without plugging in)
i botched it somewheres
Show more

The new value of a is a/2 and the new value of b is 2b.

Thus the new value of c is (2b)^3/(a/2)=16b^3/a=16c.



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Problem Solving (PS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
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