The figure is not drawn to scale. Tank J measuring 50 cm by 44 cm by 20 cm contained 13.4 ℓ of water. Tank K measuring 40 cm by 25 cm by 33 cm contained 20 ℓ of water. Owen poured some water from Tank J into Tank K without spilling and the water level of Tank K rose to 29 cm. What was the height of water level left in Tank J?
1 ℓ = 1000 cm³
20 ℓ = 20000 cm³
13.4 ℓ = 13.4 x 1000 = 13400 cm³

Height of water in Tank K at first
= 20000 ÷ 40 ÷ 25
= 20 cm

Increase in the height of water in Tank K
= 29 - 20
= 9 cm

Volume of water poured into Tank K
= 40 x 25 x 9
= 9000 cm³ 

Volume of water left in Tank J
= 13400 - 9000
= 4400 cm³ 

Height of water left in Tank J
= 4400 ÷ 50 ÷ 44
= 2 cm

Answer(s): 2 cm