Two different positions of the same dice are shown, the six faces of which are numbered from 11 to 16. Select the number that will be on the face opposite to the one showing '15'.

16

Step 1) In figure 1  and 2

Step 2) Compare both the figure and we find out 11 and 14  both are common

Step 3)  Therefore 16 is the number which will be opposite to 15