The figure is not drawn to scale. Tank Y measuring 48 cm by 45 cm by 13 cm contained 19.48 ℓ of water. Tank Z measuring 40 cm by 25 cm by 36 cm contained 13 ℓ of water. Elijah poured some water from Tank Y into Tank Z without spilling and the water level of Tank Z rose to 26 cm. What was the height of water level left in Tank Y?
1 ℓ = 1000 cm³
13 ℓ = 13000 cm³
19.48 ℓ = 19.48 x 1000 = 19480 cm³

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

Increase in the height of water in Tank Z
= 26 - 13
= 13 cm

Volume of water poured into Tank Z
= 40 x 25 x 13
= 13000 cm³ 

Volume of water left in Tank Y
= 19480 - 13000
= 6480 cm³ 

Height of water left in Tank Y
= 6480 ÷ 48 ÷ 45
= 3 cm

Answer(s): 3 cm