The figure is not drawn to scale. Tank J measuring 52 cm by 45 cm by 15 cm contained 27.42 ℓ of water. Tank K measuring 40 cm by 30 cm by 36 cm contained 18 ℓ of water. Michael poured some water from Tank J into Tank K without spilling and the water level of Tank K rose to 32 cm. What was the height of water level left in Tank J?
1 ℓ = 1000 cm³
18 ℓ = 18000 cm³
27.42 ℓ = 27.42 x 1000 = 27420 cm³

Height of water in Tank K at first
= 18000 ÷ 40 ÷ 30
= 15 cm

Increase in the height of water in Tank K
= 32 - 15
= 17 cm

Volume of water poured into Tank K
= 40 x 30 x 17
= 20400 cm³ 

Volume of water left in Tank J
= 27420 - 20400
= 7020 cm³ 

Height of water left in Tank J
= 7020 ÷ 52 ÷ 45
= 3 cm

Answer(s): 3 cm