The figure is not drawn to scale. Tank K measuring 55 cm by 42 cm by 25 cm contained 9.74 ℓ of water. Tank L measuring 40 cm by 32 cm by 36 cm contained 32 ℓ of water. Eric poured some water from Tank K into Tank L without spilling and the water level of Tank L rose to 29 cm. What was the height of water level left in Tank K?
1 ℓ = 1000 cm³
32 ℓ = 32000 cm³
9.74 ℓ = 9.74 x 1000 = 9740 cm³

Height of water in Tank L at first
= 32000 ÷ 40 ÷ 32
= 25 cm

Increase in the height of water in Tank L
= 29 - 25
= 4 cm

Volume of water poured into Tank L
= 40 x 32 x 4
= 5120 cm³ 

Volume of water left in Tank K
= 9740 - 5120
= 4620 cm³ 

Height of water left in Tank K
= 4620 ÷ 55 ÷ 42
= 2 cm

Answer(s): 2 cm