The figure is not drawn to scale. Tank B measuring 54 cm by 45 cm by 25 cm contained 20.28 ℓ of water. Tank C measuring 44 cm by 30 cm by 34 cm contained 33 ℓ of water. Wesley poured some water from Tank B into Tank C without spilling and the water level of Tank C rose to 33 cm. What was the height of water level left in Tank B?
1 ℓ = 1000 cm³
33 ℓ = 33000 cm³
20.28 ℓ = 20.28 x 1000 = 20280 cm³

Height of water in Tank C at first
= 33000 ÷ 44 ÷ 30
= 25 cm

Increase in the height of water in Tank C
= 33 - 25
= 8 cm

Volume of water poured into Tank C
= 44 x 30 x 8
= 10560 cm³ 

Volume of water left in Tank B
= 20280 - 10560
= 9720 cm³ 

Height of water left in Tank B
= 9720 ÷ 54 ÷ 45
= 4 cm

Answer(s): 4 cm