The figure is not drawn to scale. Tank W measuring 54 cm by 42 cm by 25 cm contained 23.8 ℓ of water. Tank X measuring 40 cm by 28 cm by 37 cm contained 28 ℓ of water. Liam poured some water from Tank W into Tank X without spilling and the water level of Tank X rose to 26 cm. What was the height of water level left in Tank W?
1 ℓ = 1000 cm³
28 ℓ = 28000 cm³
23.8 ℓ = 23.8 x 1000 = 23800 cm³

Height of water in Tank X at first
= 28000 ÷ 40 ÷ 28
= 25 cm

Increase in the height of water in Tank X
= 26 - 25
= 1 cm

Volume of water poured into Tank X
= 40 x 28 x 1
= 1120 cm³ 

Volume of water left in Tank W
= 23800 - 1120
= 22680 cm³ 

Height of water left in Tank W
= 22680 ÷ 54 ÷ 42
= 10 cm

Answer(s): 10 cm