22. The length of rectangular room is 4 metres. If it can be partitioned into two equal square rooms, what is the length of each partition in metres?

23. Of the two square fields the area of the one is 1 hectare, while the another one is broader by 1%. The difference in areas is:

24. The cost of carpeting a room 15 metres long with a carpet 75 cm wide at 30 paise per metre is Rs. 36. The breadth of the room is: