The figure is not drawn to scale. Tank U measuring 50 cm by 44 cm by 25 cm contained 20.84 ℓ of water. Tank V measuring 40 cm by 26 cm by 34 cm contained 26 ℓ of water. Justin poured some water from Tank U into Tank V without spilling and the water level of Tank V rose to 26 cm. What was the height of water level left in Tank U?
1 ℓ = 1000 cm³
26 ℓ = 26000 cm³
20.84 ℓ = 20.84 x 1000 = 20840 cm³

Height of water in Tank V at first
= 26000 ÷ 40 ÷ 26
= 25 cm

Increase in the height of water in Tank V
= 26 - 25
= 1 cm

Volume of water poured into Tank V
= 40 x 26 x 1
= 1040 cm³ 

Volume of water left in Tank U
= 20840 - 1040
= 19800 cm³ 

Height of water left in Tank U
= 19800 ÷ 50 ÷ 44
= 9 cm

Answer(s): 9 cm