The figure is not drawn to scale. Tank M measuring 50 cm by 44 cm by 15 cm contained 27 ℓ of water. Tank N measuring 40 cm by 25 cm by 34 cm contained 15 ℓ of water. Andy poured some water from Tank M into Tank N without spilling and the water level of Tank N rose to 31 cm. What was the height of water level left in Tank M?
1 ℓ = 1000 cm³
15 ℓ = 15000 cm³
27 ℓ = 27 x 1000 = 27000 cm³

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

Increase in the height of water in Tank N
= 31 - 15
= 16 cm

Volume of water poured into Tank N
= 40 x 25 x 16
= 16000 cm³ 

Volume of water left in Tank M
= 27000 - 16000
= 11000 cm³ 

Height of water left in Tank M
= 11000 ÷ 50 ÷ 44
= 5 cm

Answer(s): 5 cm