7. A rectangular sheet of iron was divided into two parts such that the first part was four times larger than the second. What is the area of the entire sheet if the first part is $2208 \mathrm{~cm}^{2}$ larger than the second?
7. 8) $4-1=3$ hours - corresponds to $2208 \mathrm{~cm}^{2}$;
2) $2208: 3=736 \mathrm{~cm}^{2}$ - corresponds to one part;
3) $4+1=5$ hours - total equal parts in the rectangle;
4) $736 \times 5=3680 \mathrm{~cm}^{2}$ - area of the rectangle.

Answer: the area of the rectangle is $3680 \mathrm{~cm}^{2}$.

## EIGHTEENTH