The figure is not drawn to scale. Tank B measuring 50 cm by 46 cm by 25 cm contained 23.42 ℓ of water. Tank C measuring 40 cm by 34 cm by 37 cm contained 34 ℓ of water. Tommy poured some water from Tank B into Tank C without spilling and the water level of Tank C rose to 27 cm. What was the height of water level left in Tank B?
1 ℓ = 1000 cm³
34 ℓ = 34000 cm³
23.42 ℓ = 23.42 x 1000 = 23420 cm³

Height of water in Tank C at first
= 34000 ÷ 40 ÷ 34
= 25 cm

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

Volume of water poured into Tank C
= 40 x 34 x 2
= 2720 cm³ 

Volume of water left in Tank B
= 23420 - 2720
= 20700 cm³ 

Height of water left in Tank B
= 20700 ÷ 50 ÷ 46
= 9 cm

Answer(s): 9 cm