Below are four different positions of the same die. Which number will appear on the face opposite to the face with number ’23’?

From the first cube:
Top = 25, sides = 23 and 22 → so 23 is adjacent to 25 and 22

From the fourth cube:
Top = 23, sides = 21 and 26 → so 23 is adjacent to 21 and 26

Thus, numbers adjacent to 23 are: 25, 22, 21, 26 (four faces)

A cube has 6 faces, so the only number left is 24, which must be opposite to 23.

Correct answer: 24