The figure is not drawn to scale. Tank F measuring 48 cm by 43 cm by 20 cm contained 38.84 ℓ of water. Tank G measuring 40 cm by 35 cm by 37 cm contained 28 ℓ of water. Xavier poured some water from Tank F into Tank G without spilling and the water level of Tank G rose to 33 cm. What was the height of water level left in Tank F?
1 ℓ = 1000 cm³
28 ℓ = 28000 cm³
38.84 ℓ = 38.84 x 1000 = 38840 cm³

Height of water in Tank G at first
= 28000 ÷ 40 ÷ 35
= 20 cm

Increase in the height of water in Tank G
= 33 - 20
= 13 cm

Volume of water poured into Tank G
= 40 x 35 x 13
= 18200 cm³ 

Volume of water left in Tank F
= 38840 - 18200
= 20640 cm³ 

Height of water left in Tank F
= 20640 ÷ 48 ÷ 43
= 10 cm

Answer(s): 10 cm