Six numbers 1, 3, 5, 6, 7 and 8 are written on different faces of a dice. Two positions of this dice are shown in the figure. Which is the number on the face opposite to the face containing 6?

Correct option is C

Explanation:
Validate with given positions:
The first position has numbers 1, 8, and 3.
The second position has numbers 7, 5, and 3.
Face 3 is common for both positions, keep that face constant and moves in a clockwise direction, we get the faces opposite to each other.

From the above the opposite faces, we see 1 is opposite to 7 and 8 is opposite to 5.
Therefore, 3 will be on the face opposite to the face 6.
Hence, option (c) is correct.