The figure is not drawn to scale. Tank X measuring 54 cm by 45 cm by 25 cm contained 7.5 ℓ of water. Tank Y measuring 44 cm by 30 cm by 37 cm contained 33 ℓ of water. Mark poured some water from Tank X into Tank Y without spilling and the water level of Tank Y rose to 27 cm. What was the height of water level left in Tank X?
1 ℓ = 1000 cm³
33 ℓ = 33000 cm³
7.5 ℓ = 7.5 x 1000 = 7500 cm³

Height of water in Tank Y at first
= 33000 ÷ 44 ÷ 30
= 25 cm

Increase in the height of water in Tank Y
= 27 - 25
= 2 cm

Volume of water poured into Tank Y
= 44 x 30 x 2
= 2640 cm³ 

Volume of water left in Tank X
= 7500 - 2640
= 4860 cm³ 

Height of water left in Tank X
= 4860 ÷ 54 ÷ 45
= 2 cm

Answer(s): 2 cm