The figure is not drawn to scale. Tank J measuring 55 cm by 41 cm by 25 cm contained 8.51 ℓ of water. Tank K measuring 40 cm by 25 cm by 37 cm contained 25 ℓ of water. Zane poured some water from Tank J into Tank K without spilling and the water level of Tank K rose to 29 cm. What was the height of water level left in Tank J?
1 ℓ = 1000 cm³
25 ℓ = 25000 cm³
8.51 ℓ = 8.51 x 1000 = 8510 cm³

Height of water in Tank K at first
= 25000 ÷ 40 ÷ 25
= 25 cm

Increase in the height of water in Tank K
= 29 - 25
= 4 cm

Volume of water poured into Tank K
= 40 x 25 x 4
= 4000 cm³ 

Volume of water left in Tank J
= 8510 - 4000
= 4510 cm³ 

Height of water left in Tank J
= 4510 ÷ 55 ÷ 41
= 2 cm

Answer(s): 2 cm