The figure is not drawn to scale. Tank E measuring 50 cm by 44 cm by 25 cm contained 26.8 ℓ of water. Tank F measuring 40 cm by 25 cm by 33 cm contained 25 ℓ of water. Zeph poured some water from Tank E into Tank F without spilling and the water level of Tank F rose to 32 cm. What was the height of water level left in Tank E?
1 ℓ = 1000 cm³
25 ℓ = 25000 cm³
26.8 ℓ = 26.8 x 1000 = 26800 cm³

Height of water in Tank F at first
= 25000 ÷ 40 ÷ 25
= 25 cm

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

Volume of water poured into Tank F
= 40 x 25 x 7
= 7000 cm³ 

Volume of water left in Tank E
= 26800 - 7000
= 19800 cm³ 

Height of water left in Tank E
= 19800 ÷ 50 ÷ 44
= 9 cm

Answer(s): 9 cm