17) What is the volume of a rectangular tank of 30 m length, 20m width and 10m height?

18) What is volume of the cylinder whose radius is 7 cm and height 12 cm?

19) What is the volume of sphere of radius 7 cm?

20) What is the formula for finding volume of a hollow cylinder having outer radius 'R' inner radius 'r' and height 'h'?

21) What is the capacity of a conical tank of radius 2 m and height 5m?