A farmer uses 1,8 ha to grow plants from 5 ha land.

He grows corn in 5/6 of the 1.8 ha land.

How percent of the whole land does he use to grow corn?

30%

Step-by-step explanation:

The entire piece of land has an area of 5 ha.

He uses 1.8 ha out of the 5 ha for planting.

He grows corn in 5/6 of the 1.8 ha.

5/6 of 1.8 ha is 5/6 * 1.8 ha = 1.5 ha.

Now we need to know what percent 1.5 ha is of 5 ha.

To find what percent a part is of the whole, divide the part by the whole and multiply by 100.

percent = 1.5/5 * 100% = 0.3 * 100% = 30%

Answer: 30%