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Fractional part of total surface area

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Fractional part of total surface area

by mehravikas » Sun Jun 01, 2008 12:39 am
S2-16 What fractional part of the total surface area of cube C is red?

(1) Each of 3 faces of C is exactly red.
(2) Each of 3 faces of C is entirely white.
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by amitansu » Sun Jun 01, 2008 9:10 am
A should be ans here.

From 1 : surface area of red face=3a^2 (assume a is side)
total surface area=6a^2

so sufficient
From 2:no idea about red face.so insufficient.
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by mehravikas » Mon Jun 02, 2008 2:08 am
Hey Amit,

There is small mistake, please read the question below -

S2-16 What fractional part of the total surface area of cube C is red?

(1) Each of 3 faces of C is exactly 1/2 red.
(2) Each of 3 faces of C is entirely white.
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by amitansu » Mon Jun 02, 2008 4:04 am
Still A would be ans.Since data about exact red face is given.
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by mehravikas » Tue Jun 03, 2008 2:51 am
OA is - 'C'
amitansu wrote:Still A would be ans.Since data about exact red face is given.
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by molt_llest » Tue Jun 03, 2008 3:09 am
I would say is C because in (1) we know that 1,5 out of 3 faces are red but we don't know wether the other 3 gfaces are red. In (2) we don't know anything about the red faces. Putting togheter (1) and (2) we know the colour of the 6 faces.
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by mehravikas » Tue Jun 03, 2008 1:52 pm
Yeah...!! I think explanation is very logical. We don't need to put formulas to solve this question.
molt_llest wrote:I would say is C because in (1) we know that 1,5 out of 3 faces are red but we don't know wether the other 3 gfaces are red. In (2) we don't know anything about the red faces. Putting togheter (1) and (2) we know the colour of the 6 faces.
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