Problem 4. On each of the two dice, the sum of the number of dots on each pair of opposite faces is 7. In the diagram, three of the horizontal faces of the two dice are not visible. What is the sum of the number of dots on these three hidden faces of the dice in the diagram?

![](https://cdn.mathpix.com/cropped/2024_06_05_c3c23cf15e32fbc44a06g-02.jpg?height=252&width=176&top_left_y=537&top_left_x=1306)
Solution. The sum of the number of dots on each pair of opposite faces is 7, so the sum of the two pairs of horizontal faces of the two dice is 14. There are 3 dots on the top (visible) face, so the remaining 3 faces (invisible) have $14-3=11$ dots.

## V section