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500 ds test4 #18

This topic has 2 member replies
dunkin77 Master | Next Rank: 500 Posts Default Avatar
Joined
01 Apr 2007
Posted:
269 messages

500 ds test4 #18

Post Thu Apr 05, 2007 4:43 pm
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    Hi,

    I thought the answer is E) or C) but turned out to be D)....

    I thought even thought the total area is same, the length of each side could be different, and thus the volum could be different.... If the answer is D), that means the cube that has the same area size always have the same volum size too?

    . What is the volume of a certain cube?
    (1) The sum of the areas of the faces of the cube is 54.
    (2) The greatest possible distance between two points on the cube is

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    jayhawk2001 Community Manager
    Joined
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    Post Thu Apr 05, 2007 9:19 pm
    A cube has sides of the same length.

    1 - sufficient. 6a^2 = 54. we can hence calculate a^3

    2 - sufficient. You don't need to solve this. It is enough to know that
    the greatest distance between 2 points can be represented in
    terms of side a.

    Hence D

    dunkin77 Master | Next Rank: 500 Posts Default Avatar
    Joined
    01 Apr 2007
    Posted:
    269 messages
    Post Thu Apr 05, 2007 9:50 pm
    Thank you - if cube always has the same length... that will explain !! Razz

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