The figure is not drawn to scale. Container P is filled with water to a height of 20 cm. The water in Container P is poured into 2 rectangular tanks, Container Q and Container R, such that the heights of the water in the 3 tanks are equal. Find the volume of water poured out of Container P in litres.
Volume of water
= 40 x 26 x 20
= 20800 cm³ 

Combined base area
= (40 x 26) + (24 x 20) + (18 x 8)
= 1040 + 480 + 144
= 1664 cm² 

Height of water after pouring
= 20800 ÷ 1664
= 12.5 cm

Difference in the height of water
= 20 - 12.5
= 7.5 cm

Volume of water poured out of Container P
= 40 x 26 x 7.5
= 7800 cm³ 

1000 cm³ = 1 ℓ
7800 cm³ = 7800 ÷ 1000 = 7.8 ℓ

Answer(s): 7.8 ℓ