The figure is not drawn to scale. Tank K measuring 55 cm by 47 cm by 12 cm contained 26.17 ℓ of water. Tank L measuring 40 cm by 25 cm by 36 cm contained 12 ℓ of water. Eric poured some water from Tank K into Tank L without spilling and the water level of Tank L rose to 33 cm. What was the height of water level left in Tank K?
1 ℓ = 1000 cm³
12 ℓ = 12000 cm³
26.17 ℓ = 26.17 x 1000 = 26170 cm³

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

Increase in the height of water in Tank L
= 33 - 12
= 21 cm

Volume of water poured into Tank L
= 40 x 25 x 21
= 21000 cm³ 

Volume of water left in Tank K
= 26170 - 21000
= 5170 cm³ 

Height of water left in Tank K
= 5170 ÷ 55 ÷ 47
= 2 cm

Answer(s): 2 cm