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plss help me 2 mrrw is my gmat exam

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plss help me 2 mrrw is my gmat exam [#permalink] New post 29 Sep 2011, 10:40
question 1 : a cylinder with radius 5 inches placed upright in rectangular box of 8*10*12.what is the maximum possible volume of cylinder??/

ans :200*pie

question 2:if a, b , c are the roots of qudratic equations ,where c is common root.find the value of (X-a/X-b)??
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Re: plss help me 2 mrrw is my gmat exam [#permalink] New post 30 Sep 2011, 02:29
KaranSingh wrote:
question 1 : a cylinder with radius 5 inches placed upright in rectangular box of 8*10*12.what is the maximum possible volume of cylinder??/

ans :200*pie

question 2:if a, b , c are the roots of quadratic equations ,where c is common root.find the value of (X-a/X-b)??


KaranSingh - Please make sure to post the full questions - in separated posts and include the full answers. Otherwise you are hurting the other people's practice.
Good luck tomorrow.

Answer 1:
TIP (not related to this question directly) - given two sizes to choose from - a cylinder will have more volume if the bigger number is it's radius and not his height. (surface of the base is squared and height it not).

now - about question number 1 - few steps to follow -
radius 5 means that the diagonal is 10. therefore - the base can be ONLY the face with the 10*12 dimension.
all the other positions will not be able to hold a circle with radios of 5.
so - the height is 8.
(remember - cylinder's volume = the base's surface*height).
therefore:
base surface - Pie*r^2 = Pie * 25
Height is 8
so the full answer would be - 8*25*pie = 200*pie.

Question number 2 is not clear to me and it will be helpful if you post the answers.
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Re: plss help me 2 mrrw is my gmat exam   [#permalink] 30 Sep 2011, 02:29
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