The price of rice falls by 20%. How much rice can be bought now with the money that was sufficient to buy 20 kg of rice previously ?

Given that the price of rice falls by 20%

It means if the cost of one kg rice is 100 rupees, now its cost is Rs 80.

The cost of 20 kgs rice is 2000 rupees

with that 2000 rupees, if the cost of the rice per kg is Rs 80, we can get 25 kgs

Therefore, The amount of rice that can be bough now iwth the money that was sufficient to buy 20 kg of rice previously is $\boxed{\mathbf{25}\mathbf{ }\mathbf{k}\mathbf{g}}$