The figure is not drawn to scale. Tank T measuring 50 cm by 46 cm by 20 cm contained 13 ℓ of water. Tank U measuring 40 cm by 35 cm by 32 cm contained 28 ℓ of water. Ken poured some water from Tank T into Tank U without spilling and the water level of Tank U rose to 26 cm. What was the height of water level left in Tank T?
1 ℓ = 1000 cm³
28 ℓ = 28000 cm³
13 ℓ = 13 x 1000 = 13000 cm³

Height of water in Tank U at first
= 28000 ÷ 40 ÷ 35
= 20 cm

Increase in the height of water in Tank U
= 26 - 20
= 6 cm

Volume of water poured into Tank U
= 40 x 35 x 6
= 8400 cm³ 

Volume of water left in Tank T
= 13000 - 8400
= 4600 cm³ 

Height of water left in Tank T
= 4600 ÷ 50 ÷ 46
= 2 cm

Answer(s): 2 cm