It is given that
Diameter of the bowl = 7cm
We know that
Radius of the bowl = 7/2 = 3.5cm
Height = 4cm
We know that
Volume of soup in one bowl = πr2h
By substituting the values
Volume of soup in one bowl = (22/7) × (3.5)2 × 4
So we get
Volume of soup in one bowl = 154cm3
So the volume of soup in 250 bowls = 250 × 154
On further calculation
Volume of soup in 250 bowls = 38500 cm3 = 38.5 litres
Therefore, the hospital must prepare 38.5 litres of soup daily to serve 250 patients.