The figure is not drawn to scale. Tank Q measuring 54 cm by 45 cm by 20 cm contained 30.44 ℓ of water. Tank R measuring 44 cm by 25 cm by 37 cm contained 22 ℓ of water. Sam poured some water from Tank Q into Tank R without spilling and the water level of Tank R rose to 30 cm. What was the height of water level left in Tank Q?
1 ℓ = 1000 cm³
22 ℓ = 22000 cm³
30.44 ℓ = 30.44 x 1000 = 30440 cm³

Height of water in Tank R at first
= 22000 ÷ 44 ÷ 25
= 20 cm

Increase in the height of water in Tank R
= 30 - 20
= 10 cm

Volume of water poured into Tank R
= 44 x 25 x 10
= 11000 cm³ 

Volume of water left in Tank Q
= 30440 - 11000
= 19440 cm³ 

Height of water left in Tank Q
= 19440 ÷ 54 ÷ 45
= 8 cm

Answer(s): 8 cm