The figure is not drawn to scale. Tank C measuring 48 cm by 45 cm by 25 cm contained 21.6 ℓ of water. Tank D measuring 40 cm by 27 cm by 33 cm contained 27 ℓ of water. Peter poured some water from Tank C into Tank D without spilling and the water level of Tank D rose to 27 cm. What was the height of water level left in Tank C?
1 ℓ = 1000 cm³
27 ℓ = 27000 cm³
21.6 ℓ = 21.6 x 1000 = 21600 cm³

Height of water in Tank D at first
= 27000 ÷ 40 ÷ 27
= 25 cm

Increase in the height of water in Tank D
= 27 - 25
= 2 cm

Volume of water poured into Tank D
= 40 x 27 x 2
= 2160 cm³ 

Volume of water left in Tank C
= 21600 - 2160
= 19440 cm³ 

Height of water left in Tank C
= 19440 ÷ 48 ÷ 45
= 9 cm

Answer(s): 9 cm