What fractional part of the total surface area of cube C is

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What fractional part of the total surface area of cube C is [#permalink]

02 Apr 2009, 00:40

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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 1/2 white.

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Re: DS....S2 [#permalink]

02 Apr 2009, 03:24

is it E?
Moderator, please shift it to DS section
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Re: DS....S2 [#permalink]

02 Apr 2009, 18:19

It is C

I was perplexed why the A & B are talking about 3 faces when a cube has 6 faces

Because the faces in A & B are mutually exclusive faces making up for total of 6 faces

If S is the side of the cube, each one's area is S ^2 and 3 halves of that is (3 S ^ 2) /2 divided by 6S ^2 shoudl give 1/4

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Re: DS....S2 [#permalink]

07 Apr 2009, 21:30

milind1979 wrote:

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 1/2 white.

1: Each of 3 faces of C is exactly 1/2 red.

lol... what about rest 3 faces? do not know..nsf..

2: Each of 3 faces of C is entirely 1/2 white.
Ok, 1/2 of each of 3 faces is white but what about the other 1/2 of the each of 3 faces? The other half could be green. 1/2 white doesnot mean that the other 1/2 is red..........nsf..

Togather also nsf as st. 2 is not ambigious...
The 3 faces in st.2 could be the same faces that were in st.1.

E.
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Re: DS....S2 [#permalink]

08 Apr 2009, 11:45

I think it's E.

stmnt1 - nsf, because it's not known how the 4th face of the cube is painted
stmnt2 - nsf, because it's not known how the 4th face of the cube is painted

Combining them does not help.

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Re: DS....S2 [#permalink]

08 Apr 2009, 23:39

milind1979 wrote:

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 1/2 white.

Question has mistake in it. I dont understand what does "entirely 1/2 white" mean.

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Re: DS....S2 [#permalink]

13 Apr 2009, 19:50

I feel it should be E.

Re: DS....S2 [#permalink] 13 Apr 2009, 19:50

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What fractional part of the total surface area of cube C is

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What fractional part of the total surface area of cube C is

What fractional part of the total surface area of cube C is

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