fractional part

[Nafetsus]

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.

--> B is out because we don't know the colours of the other 3 faces. But why is A not the answer? (Because we do not know wether the other 3 faces are entirely red???)

[Lock]

IMO (C).
Cube has 6 equal surfaces.

Statement 1: This only says that 3 out of six surfaces are half red. We do not know if the remaining 3 surfaces are 1/4 red, say. - INSUFFICIENT
Statement 2: This only says that 3 out of six surfaces are white. We do not know the info on the remaining 3 surfaces. - INSUFFICIENT

Combining both statements together we can say that only three surfaces out of six are half red. We also know that the remaining surfaces aren't red. - SUFFICIENT.
Hence, C.

[Nafetsus]

Thanks Lock!

[abhishek_mumbai]

Imo C..

[aaadith]

IMO its A..stmt 1 says 3 faces are half-painted with red..we know that a cube has 6 faces..the required fraction : 3*0.5/6=1.5/6=1/4

a little confused here...is the above approach correct? or should we go about thinking that, parts or whole of the remaining faces also could be painted red?

[Nafetsus]

Yes, you got it. The confusion is that we do not know wether the other 3 faces are 1/4 red, or completely red, or ...