One cement tank using 1 sq.m. and provides 1 kilogram of paddy
Growing rice in 10tanks using 10 sq.m.
We’ll get 10 kilograms of paddy
If We grow 4 times a year we’ll get 40 kilograms of paddy ,after milling we’ll get 25 kilograms of rice
Which is 40% of the consumption of one person in one year