The figure is not drawn to scale. Tank V measuring 49 cm by 44 cm by 25 cm contained 28.36 ℓ of water. Tank W measuring 40 cm by 34 cm by 36 cm contained 34 ℓ of water. Paul poured some water from Tank V into Tank W without spilling and the water level of Tank W rose to 30 cm. What was the height of water level left in Tank V?
1 ℓ = 1000 cm³
34 ℓ = 34000 cm³
28.36 ℓ = 28.36 x 1000 = 28360 cm³

Height of water in Tank W at first
= 34000 ÷ 40 ÷ 34
= 25 cm

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

Volume of water poured into Tank W
= 40 x 34 x 5
= 6800 cm³ 

Volume of water left in Tank V
= 28360 - 6800
= 21560 cm³ 

Height of water left in Tank V
= 21560 ÷ 49 ÷ 44
= 10 cm

Answer(s): 10 cm