How many acres is 20 hectares?
One hectare equals 15 mu, so 20 hectare equals 20 * 15 = 300 mu,
How many hectares is 0.25 square kilometers
25
3 / 25 sq km = () ha
1 ha = 10 000 m2
1 sq km = 1 000 000 sq m
So 1 square kilometer = 100 hectares
So 3 / 25 square kilometers = 3 / 25 × 100 = 12 hectares