Six numbers 1, 2, 3, 4, 5 and 6 are written on different faces of a dice. Two positions of this dice are shown in the figure. Find the number on the face opposite to 4.[Image showing two views of a single dice. View 1 shows faces 1, 2, 3. View 2 shows faces 1, 5, 6.]

From the two positions of the dice, the common face is $1$.Let's list the numbers by moving in a clockwise direction from the common face $1$:Position 1: $1\to 2\to 3$ Position 2: $1\to 6\to 5$ Comparing the two paths:Face opposite to $2$ is $6$.Face opposite to $3$ is $5$.Therefore, the remaining face opposite to $1$ must be $4$.Thus, the face opposite to $4$ is $1$.