The figure is not drawn to scale. Tank Y measuring 50 cm by 41 cm by 25 cm contained 16.43 ℓ of water. Tank Z measuring 40 cm by 26 cm by 33 cm contained 26 ℓ of water. Julian poured some water from Tank Y into Tank Z without spilling and the water level of Tank Z rose to 27 cm. What was the height of water level left in Tank Y?
1 ℓ = 1000 cm³
26 ℓ = 26000 cm³
16.43 ℓ = 16.43 x 1000 = 16430 cm³

Height of water in Tank Z at first
= 26000 ÷ 40 ÷ 26
= 25 cm

Increase in the height of water in Tank Z
= 27 - 25
= 2 cm

Volume of water poured into Tank Z
= 40 x 26 x 2
= 2080 cm³ 

Volume of water left in Tank Y
= 16430 - 2080
= 14350 cm³ 

Height of water left in Tank Y
= 14350 ÷ 50 ÷ 41
= 7 cm

Answer(s): 7 cm