The figure is not drawn to scale. Tank X measuring 53 cm by 42 cm by 13 cm contained 26.13 ℓ of water. Tank Y measuring 40 cm by 25 cm by 32 cm contained 13 ℓ of water. Fred poured some water from Tank X into Tank Y without spilling and the water level of Tank Y rose to 28 cm. What was the height of water level left in Tank X?
1 ℓ = 1000 cm³
13 ℓ = 13000 cm³
26.13 ℓ = 26.13 x 1000 = 26130 cm³

Height of water in Tank Y at first
= 13000 ÷ 40 ÷ 25
= 13 cm

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

Volume of water poured into Tank Y
= 40 x 25 x 15
= 15000 cm³ 

Volume of water left in Tank X
= 26130 - 15000
= 11130 cm³ 

Height of water left in Tank X
= 11130 ÷ 53 ÷ 42
= 5 cm

Answer(s): 5 cm