The figure is not drawn to scale. Tank M measuring 55 cm by 46 cm by 17 cm contained 17.06 ℓ of water. Tank N measuring 40 cm by 25 cm by 32 cm contained 17 ℓ of water. Mark poured some water from Tank M into Tank N without spilling and the water level of Tank N rose to 29 cm. What was the height of water level left in Tank M?
1 ℓ = 1000 cm³
17 ℓ = 17000 cm³
17.06 ℓ = 17.06 x 1000 = 17060 cm³

Height of water in Tank N at first
= 17000 ÷ 40 ÷ 25
= 17 cm

Increase in the height of water in Tank N
= 29 - 17
= 12 cm

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

Volume of water left in Tank M
= 17060 - 12000
= 5060 cm³ 

Height of water left in Tank M
= 5060 ÷ 55 ÷ 46
= 2 cm

Answer(s): 2 cm