A rectangular glass water tank with a length of 40cm, a width of 20cm and a height of 30cm (measured from the inside) has a water depth of 18cm Come on, don't use equations

A rectangular glass water tank with a length of 40cm, a width of 20cm and a height of 30cm (measured from the inside) has a water depth of 18cm Come on, don't use equations

40 × 20 × (25-18) = 5600 cm3
The volume of the iron ball is 5600 cubic centimeters