Diameter of the cylinder = 0.4 m => radius (r) = 0.2 meter
Height of the cylinder (h) = 0.2x3/4 = 0.15 meter
Volume of the cylinder = πr2h
= 3.14 x (0.2)2 x 0.15
= 0.01884 cube meter
1 cube meter = 1000 litres
Volume of the cylinder in litres = 0.01884x 1000 = 18.84 litres