The length of the rectangular bed is 5 m and the width is 20 dm. The bed was lengthened by 1m.

The length of the rectangular bed is 5 m and the width is 20 dm. The bed was lengthened by 1m. What is the area of the garden?

The bed was lengthened by 1 meter, which means that its length has become 1 meter longer.

Ten decimeters make up one meter, and twenty decimeters make up two meters.

The solution of the problem:

20 dm = 2 m;

5 + 1 = 6 (m) was the length of the bed after lengthening;
6 * 2 = 12 (m ^ 2) became the area of the garden.

Method 2.

5 * 2 = 10 (m ^ 2) the initial area of the garden;
1 * 2 = 2 (m ^ 2) the area of the garden has increased by this amount;
10 + 2 = 12 (m ^ 2) became the area of the garden.
Answer: 12 square meters became the area of the garden.