The figure is not drawn to scale. Tank X measuring 55 cm by 44 cm by 25 cm contained 15.08 ℓ of water. Tank Y measuring 40 cm by 27 cm by 32 cm contained 27 ℓ of water. Lee poured some water from Tank X into Tank Y without spilling and the water level of Tank Y rose to 30 cm. What was the height of water level left in Tank X?
1 ℓ = 1000 cm³
27 ℓ = 27000 cm³
15.08 ℓ = 15.08 x 1000 = 15080 cm³

Height of water in Tank Y at first
= 27000 ÷ 40 ÷ 27
= 25 cm

Increase in the height of water in Tank Y
= 30 - 25
= 5 cm

Volume of water poured into Tank Y
= 40 x 27 x 5
= 5400 cm³ 

Volume of water left in Tank X
= 15080 - 5400
= 9680 cm³ 

Height of water left in Tank X
= 9680 ÷ 55 ÷ 44
= 4 cm

Answer(s): 4 cm