The figure is not drawn to scale. Tank A measuring 54 cm by 46 cm by 15 cm contained 30.42 ℓ of water. Tank B measuring 40 cm by 25 cm by 37 cm contained 15 ℓ of water. Asher poured some water from Tank A into Tank B without spilling and the water level of Tank B rose to 33 cm. What was the height of water level left in Tank A?
1 ℓ = 1000 cm³
15 ℓ = 15000 cm³
30.42 ℓ = 30.42 x 1000 = 30420 cm³

Height of water in Tank B at first
= 15000 ÷ 40 ÷ 25
= 15 cm

Increase in the height of water in Tank B
= 33 - 15
= 18 cm

Volume of water poured into Tank B
= 40 x 25 x 18
= 18000 cm³ 

Volume of water left in Tank A
= 30420 - 18000
= 12420 cm³ 

Height of water left in Tank A
= 12420 ÷ 54 ÷ 46
= 5 cm

Answer(s): 5 cm