A rectangular tank,15cm and 20cm wide, was filled with water to a depth of 6cm. When a stone of volume 1800 cm³ was put in the water, the water level rose to 3/4 of the height of the tank. Find the height of the tank.

Answer 1

Height of the tank = (1800 cm³ + (15 cm x 20 cm x 6 cm)) / (15 cm x 20 cm)
= (1800 cm³ + 1200 cm³) / 300 cm²
= 3000 cm³ / 300 cm²
= 10 cm