The figure is not drawn to scale. Tank W measuring 48 cm by 42 cm by 23 cm contained 13.08 ℓ of water. Tank X measuring 40 cm by 25 cm by 33 cm contained 23 ℓ of water. Oscar 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
23 ℓ = 23000 cm³
13.08 ℓ = 13.08 x 1000 = 13080 cm³

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

Increase in the height of water in Tank X
= 26 - 23
= 3 cm

Volume of water poured into Tank X
= 40 x 25 x 3
= 3000 cm³ 

Volume of water left in Tank W
= 13080 - 3000
= 10080 cm³ 

Height of water left in Tank W
= 10080 ÷ 48 ÷ 42
= 5 cm

Answer(s): 5 cm