8-1. Two rectangles $8 \times 10$ and $12 \times 9$ are overlaid as shown in the figure. The area of the black part is 37. What is the area of the gray part? If necessary, round the answer to 0.01 or write the answer as a common fraction.

![](https://cdn.mathpix.com/cropped/2024_05_06_d2d35e627535cd91d6ebg-15.jpg?height=471&width=577&top_left_y=684&top_left_x=745)
Answer: 65.

Solution. The area of the white part is $8 \cdot 10-37=43$, so the area of the gray part is $12 \cdot 9-43=65$