The figure is not drawn to scale. Tank K measuring 51 cm by 45 cm by 18 cm contained 13.59 ℓ of water. Tank L measuring 40 cm by 25 cm by 36 cm contained 18 ℓ of water. George poured some water from Tank K into Tank L without spilling and the water level of Tank L rose to 27 cm. What was the height of water level left in Tank K?
1 ℓ = 1000 cm³
18 ℓ = 18000 cm³
13.59 ℓ = 13.59 x 1000 = 13590 cm³

Height of water in Tank L at first
= 18000 ÷ 40 ÷ 25
= 18 cm

Increase in the height of water in Tank L
= 27 - 18
= 9 cm

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

Volume of water left in Tank K
= 13590 - 9000
= 4590 cm³ 

Height of water left in Tank K
= 4590 ÷ 51 ÷ 45
= 2 cm

Answer(s): 2 cm