Three different positions of the same dice are shown here. Which number is on the face opposite the face showing ‘5’?

If we take number 4, it will have 4 numbers adjacent to it on 4sides.

From figures, it is evident that the adjacent numbers for 4 are 6,2,1,5

From 1st dice, left side of 4 is 2 & top side is 6. Remaining sides to be known are right side and bottom side & numbers left are 1,5.

5 cannot be on bottom side as 5 is adjacent to 6 in third dice. Therefore ,5 will be on right side of 4 and it's opposite to "2". Therefore 2 is the answer.