The figure is not drawn to scale. Tank E measuring 54 cm by 45 cm by 13 cm contained 24.29 ℓ of water. Tank F measuring 40 cm by 25 cm by 33 cm contained 13 ℓ of water. David poured some water from Tank E into Tank F without spilling and the water level of Tank F rose to 30 cm. What was the height of water level left in Tank E?
1 ℓ = 1000 cm³
13 ℓ = 13000 cm³
24.29 ℓ = 24.29 x 1000 = 24290 cm³

Height of water in Tank F at first
= 13000 ÷ 40 ÷ 25
= 13 cm

Increase in the height of water in Tank F
= 30 - 13
= 17 cm

Volume of water poured into Tank F
= 40 x 25 x 17
= 17000 cm³ 

Volume of water left in Tank E
= 24290 - 17000
= 7290 cm³ 

Height of water left in Tank E
= 7290 ÷ 54 ÷ 45
= 3 cm

Answer(s): 3 cm