The figure is not drawn to scale. Tank F measuring 49 cm by 46 cm by 15 cm contained 26.87 ℓ of water. Tank G measuring 40 cm by 30 cm by 32 cm contained 18 ℓ of water. Howard poured some water from Tank F into Tank G without spilling and the water level of Tank G rose to 28 cm. What was the height of water level left in Tank F?
1 ℓ = 1000 cm³
18 ℓ = 18000 cm³
26.87 ℓ = 26.87 x 1000 = 26870 cm³

Height of water in Tank G at first
= 18000 ÷ 40 ÷ 30
= 15 cm

Increase in the height of water in Tank G
= 28 - 15
= 13 cm

Volume of water poured into Tank G
= 40 x 30 x 13
= 15600 cm³ 

Volume of water left in Tank F
= 26870 - 15600
= 11270 cm³ 

Height of water left in Tank F
= 11270 ÷ 49 ÷ 46
= 5 cm

Answer(s): 5 cm