Problem 4.1. Circular weights weigh 200 grams, square ones weigh 300 grams, and triangular ones weigh 150 grams. 12 weights were placed on the pan balance as shown in the figure. Which pan is heavier and by how many grams?

![](https://cdn.mathpix.com/cropped/2024_05_06_c60160c61c72db74c711g-1.jpg?height=577&width=493&top_left_y=414&top_left_x=482)
Answer: The right side is 250 grams heavier.

Solution. The weight of the left pan in grams is

$$
1 \cdot 300+2 \cdot 150+3 \cdot 200=1200
$$

The weight of the right pan in grams is

$$
1 \cdot 150+2 \cdot 200+3 \cdot 300=1450
$$

Thus, the right pan is 250 grams heavier than the left pan.