The figure is not drawn to scale. Tank B measuring 55 cm by 41 cm by 25 cm contained 30.67 ℓ of water. Tank C measuring 40 cm by 29 cm by 36 cm contained 29 ℓ of water. Seth poured some water from Tank B into Tank C without spilling and the water level of Tank C rose to 32 cm. What was the height of water level left in Tank B?
1 ℓ = 1000 cm³
29 ℓ = 29000 cm³
30.67 ℓ = 30.67 x 1000 = 30670 cm³

Height of water in Tank C at first
= 29000 ÷ 40 ÷ 29
= 25 cm

Increase in the height of water in Tank C
= 32 - 25
= 7 cm

Volume of water poured into Tank C
= 40 x 29 x 7
= 8120 cm³ 

Volume of water left in Tank B
= 30670 - 8120
= 22550 cm³ 

Height of water left in Tank B
= 22550 ÷ 55 ÷ 41
= 10 cm

Answer(s): 10 cm