The figure is not drawn to scale. Tank L measuring 49 cm by 46 cm by 13 cm contained 39.54 ℓ of water. Tank M measuring 40 cm by 25 cm by 36 cm contained 13 ℓ of water. Glen poured some water from Tank L into Tank M without spilling and the water level of Tank M rose to 30 cm. What was the height of water level left in Tank L?
1 ℓ = 1000 cm³
13 ℓ = 13000 cm³
39.54 ℓ = 39.54 x 1000 = 39540 cm³

Height of water in Tank M at first
= 13000 ÷ 40 ÷ 25
= 13 cm

Increase in the height of water in Tank M
= 30 - 13
= 17 cm

Volume of water poured into Tank M
= 40 x 25 x 17
= 17000 cm³ 

Volume of water left in Tank L
= 39540 - 17000
= 22540 cm³ 

Height of water left in Tank L
= 22540 ÷ 49 ÷ 46
= 10 cm

Answer(s): 10 cm