The figure is not drawn to scale. Tank U measuring 52 cm by 45 cm by 15 cm contained 21.36 ℓ of water. Tank V measuring 40 cm by 25 cm by 36 cm contained 15 ℓ of water. Fabian poured some water from Tank U into Tank V without spilling and the water level of Tank V rose to 27 cm. What was the height of water level left in Tank U?
1 ℓ = 1000 cm³
15 ℓ = 15000 cm³
21.36 ℓ = 21.36 x 1000 = 21360 cm³

Height of water in Tank V at first
= 15000 ÷ 40 ÷ 25
= 15 cm

Increase in the height of water in Tank V
= 27 - 15
= 12 cm

Volume of water poured into Tank V
= 40 x 25 x 12
= 12000 cm³ 

Volume of water left in Tank U
= 21360 - 12000
= 9360 cm³ 

Height of water left in Tank U
= 9360 ÷ 52 ÷ 45
= 4 cm

Answer(s): 4 cm