The figure is not drawn to scale. Tank C measuring 54 cm by 41 cm by 12 cm contained 37.14 ℓ of water. Tank D measuring 40 cm by 25 cm by 36 cm contained 12 ℓ of water. Ken poured some water from Tank C into Tank D without spilling and the water level of Tank D rose to 27 cm. What was the height of water level left in Tank C?
1 ℓ = 1000 cm³
12 ℓ = 12000 cm³
37.14 ℓ = 37.14 x 1000 = 37140 cm³

Height of water in Tank D at first
= 12000 ÷ 40 ÷ 25
= 12 cm

Increase in the height of water in Tank D
= 27 - 12
= 15 cm

Volume of water poured into Tank D
= 40 x 25 x 15
= 15000 cm³ 

Volume of water left in Tank C
= 37140 - 15000
= 22140 cm³ 

Height of water left in Tank C
= 22140 ÷ 54 ÷ 41
= 10 cm

Answer(s): 10 cm