The figure is not drawn to scale. Tank R measuring 53 cm by 47 cm by 25 cm contained 30.35 ℓ of water. Tank S measuring 40 cm by 34 cm by 35 cm contained 34 ℓ of water. Albert poured some water from Tank R into Tank S without spilling and the water level of Tank S rose to 29 cm. What was the height of water level left in Tank R?
1 ℓ = 1000 cm³
34 ℓ = 34000 cm³
30.35 ℓ = 30.35 x 1000 = 30350 cm³

Height of water in Tank S at first
= 34000 ÷ 40 ÷ 34
= 25 cm

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

Volume of water poured into Tank S
= 40 x 34 x 4
= 5440 cm³ 

Volume of water left in Tank R
= 30350 - 5440
= 24910 cm³ 

Height of water left in Tank R
= 24910 ÷ 53 ÷ 47
= 10 cm

Answer(s): 10 cm