The figure is not drawn to scale. Tank L measuring 55 cm by 46 cm by 20 cm contained 31.3 ℓ of water. Tank M measuring 40 cm by 25 cm by 36 cm contained 20 ℓ of water. Zeph poured some water from Tank L into Tank M without spilling and the water level of Tank M rose to 26 cm. What was the height of water level left in Tank L?
1 ℓ = 1000 cm³
20 ℓ = 20000 cm³
31.3 ℓ = 31.3 x 1000 = 31300 cm³

Height of water in Tank M at first
= 20000 ÷ 40 ÷ 25
= 20 cm

Increase in the height of water in Tank M
= 26 - 20
= 6 cm

Volume of water poured into Tank M
= 40 x 25 x 6
= 6000 cm³ 

Volume of water left in Tank L
= 31300 - 6000
= 25300 cm³ 

Height of water left in Tank L
= 25300 ÷ 55 ÷ 46
= 10 cm

Answer(s): 10 cm