There are two cubes of different sizes. One of these is coloured red on all the faces, while other is coloured green on all the faces except one which is coloured red. The one which is red on all faces is cut into 27 equal cubes, while the other one is cut into 64 equal cubes which are mixed up with other cubes.
How many cubes are coloured red only on one face?
The answer is given as (b) i.e. 16.
But, when I tried I got it as
cube I :
6 cubes with only one red face
4 cubes with only one red face
8 cubes with one red and one green face
4 cubes with one red faceand two green faces
So, it should be either 22 (if I take it as "How many cubes are coloured red, only on one face?") or 10 (if I take it as "How many cubes are coloured red only, on one face?")
So can you tell me whether the answer in the book is correct, or the answer I got (which one? first or second?) is correct?
Help me !! I am having exam tomorrow!