The figure is not drawn to scale. Tank B measuring 53 cm by 45 cm by 23 cm contained 14.54 ℓ of water. Tank C measuring 40 cm by 25 cm by 37 cm contained 23 ℓ of water. Carl poured some water from Tank B into Tank C without spilling and the water level of Tank C rose to 28 cm. What was the height of water level left in Tank B?
1 ℓ = 1000 cm³
23 ℓ = 23000 cm³
14.54 ℓ = 14.54 x 1000 = 14540 cm³

Height of water in Tank C at first
= 23000 ÷ 40 ÷ 25
= 23 cm

Increase in the height of water in Tank C
= 28 - 23
= 5 cm

Volume of water poured into Tank C
= 40 x 25 x 5
= 5000 cm³ 

Volume of water left in Tank B
= 14540 - 5000
= 9540 cm³ 

Height of water left in Tank B
= 9540 ÷ 53 ÷ 45
= 4 cm

Answer(s): 4 cm