The figure is not drawn to scale. Tank S measuring 53 cm by 44 cm by 15 cm contained 44.32 ℓ of water. Tank T measuring 40 cm by 35 cm by 36 cm contained 21 ℓ of water. Archie poured some water from Tank S into Tank T without spilling and the water level of Tank T rose to 30 cm. What was the height of water level left in Tank S?
1 ℓ = 1000 cm³
21 ℓ = 21000 cm³
44.32 ℓ = 44.32 x 1000 = 44320 cm³

Height of water in Tank T at first
= 21000 ÷ 40 ÷ 35
= 15 cm

Increase in the height of water in Tank T
= 30 - 15
= 15 cm

Volume of water poured into Tank T
= 40 x 35 x 15
= 21000 cm³ 

Volume of water left in Tank S
= 44320 - 21000
= 23320 cm³ 

Height of water left in Tank S
= 23320 ÷ 53 ÷ 44
= 10 cm

Answer(s): 10 cm