Questions

Mumbai has been ranked the world's second most densely populated city with 31,700 people per sq km, by the World Economic Forum (WEF) citing UN Habitat Data. Bangladesh's capital Dhaka topped the list with 44,500 people per sq km. Rajasthan's Kota has been ranked the world's seventh most densely populated city with 12,100 people per sq km.

It is WATER.

1. In India Alluvial Soils are most likely found in Indo-Gangetic Plains that stretches across almost East and North India. 

2. Indo-Gangetic Plains has got this name after the two rivers The Indus and The Ganges Drain th plain.

3. These soil cover more than the 35% of the total land in India.

4. These Soils are suitable for Wheat, Vegetables, Cotton, Bajra, Oil seeds,...

5. These soils tend to be sandier and has quick draining properties than many other soils in India.

Logic is

1st fig : 9x2 + 5 = 23

2nd fig : 6x3 + 4 = 22

3rd fig : Nx4 + 5 = 9 => N = 1.