Problem 4. A field in the shape of a rectangle is 72 m long and 25 m wide. How many tons of wheat will be harvested from this field if an average of 5 kg of wheat is harvested per $1 \mathrm{~m}^{2}$?
Solution. The area of the rectangle (the field) is:

$$
P=72 \cdot 25=1900 m^{2}
$$

If on average $5 \mathrm{~kg}$ of wheat is obtained from $1 \mathrm{~m}^{2}$

![](https://cdn.mathpix.com/cropped/2024_06_05_1b044dba0a21c223c4c1g-1.jpg?height=195&width=522&top_left_y=1775&top_left_x=960)
then from the field, the following will be obtained:

$1900 \cdot 5 \mathrm{~kg}=9500 \mathrm{~kg}$ of wheat.