The figure is not drawn to scale. Tank Q measuring 50 cm by 44 cm by 22 cm contained 28 ℓ of water. Tank R measuring 40 cm by 25 cm by 34 cm contained 22 ℓ of water. Jeremy poured some water from Tank Q into Tank R without spilling and the water level of Tank R rose to 28 cm. What was the height of water level left in Tank Q?
1 ℓ = 1000 cm³
22 ℓ = 22000 cm³
28 ℓ = 28 x 1000 = 28000 cm³

Height of water in Tank R at first
= 22000 ÷ 40 ÷ 25
= 22 cm

Increase in the height of water in Tank R
= 28 - 22
= 6 cm

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

Volume of water left in Tank Q
= 28000 - 6000
= 22000 cm³ 

Height of water left in Tank Q
= 22000 ÷ 50 ÷ 44
= 10 cm

Answer(s): 10 cm