The figure is not drawn to scale. Tank V measuring 55 cm by 47 cm by 23 cm contained 22.51 ℓ of water. Tank W measuring 40 cm by 25 cm by 34 cm contained 23 ℓ of water. Albert 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
23 ℓ = 23000 cm³
22.51 ℓ = 22.51 x 1000 = 22510 cm³

Height of water in Tank W at first
= 23000 ÷ 40 ÷ 25
= 23 cm

Increase in the height of water in Tank W
= 30 - 23
= 7 cm

Volume of water poured into Tank W
= 40 x 25 x 7
= 7000 cm³ 

Volume of water left in Tank V
= 22510 - 7000
= 15510 cm³ 

Height of water left in Tank V
= 15510 ÷ 55 ÷ 47
= 6 cm

Answer(s): 6 cm