The figure is not drawn to scale. Tank W measuring 53 cm by 45 cm by 25 cm contained 28.32 ℓ of water. Tank X measuring 44 cm by 30 cm by 36 cm contained 33 ℓ of water. Ian poured some water from Tank W into Tank X without spilling and the water level of Tank X rose to 32 cm. What was the height of water level left in Tank W?
1 ℓ = 1000 cm³
33 ℓ = 33000 cm³
28.32 ℓ = 28.32 x 1000 = 28320 cm³

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

Increase in the height of water in Tank X
= 32 - 25
= 7 cm

Volume of water poured into Tank X
= 44 x 30 x 7
= 9240 cm³ 

Volume of water left in Tank W
= 28320 - 9240
= 19080 cm³ 

Height of water left in Tank W
= 19080 ÷ 53 ÷ 45
= 8 cm

Answer(s): 8 cm