The figure is not drawn to scale. Tank H measuring 50 cm by 47 cm by 20 cm contained 16.7 ℓ of water. Tank J measuring 40 cm by 30 cm by 33 cm contained 24 ℓ of water. Liam poured some water from Tank H into Tank J without spilling and the water level of Tank J rose to 30 cm. What was the height of water level left in Tank H?
1 ℓ = 1000 cm³
24 ℓ = 24000 cm³
16.7 ℓ = 16.7 x 1000 = 16700 cm³

Height of water in Tank J at first
= 24000 ÷ 40 ÷ 30
= 20 cm

Increase in the height of water in Tank J
= 30 - 20
= 10 cm

Volume of water poured into Tank J
= 40 x 30 x 10
= 12000 cm³ 

Volume of water left in Tank H
= 16700 - 12000
= 4700 cm³ 

Height of water left in Tank H
= 4700 ÷ 50 ÷ 47
= 2 cm

Answer(s): 2 cm