The figure is not drawn to scale. Tank X measuring 53 cm by 44 cm by 25 cm contained 19.34 ℓ of water. Tank Y measuring 40 cm by 32 cm by 36 cm contained 32 ℓ of water. Carl poured some water from Tank X into Tank Y without spilling and the water level of Tank Y rose to 31 cm. What was the height of water level left in Tank X?
1 ℓ = 1000 cm³
32 ℓ = 32000 cm³
19.34 ℓ = 19.34 x 1000 = 19340 cm³

Height of water in Tank Y at first
= 32000 ÷ 40 ÷ 32
= 25 cm

Increase in the height of water in Tank Y
= 31 - 25
= 6 cm

Volume of water poured into Tank Y
= 40 x 32 x 6
= 7680 cm³ 

Volume of water left in Tank X
= 19340 - 7680
= 11660 cm³ 

Height of water left in Tank X
= 11660 ÷ 53 ÷ 44
= 5 cm

Answer(s): 5 cm