The figure is not drawn to scale. Tank R measuring 48 cm by 45 cm by 25 cm contained 30.84 ℓ of water. Tank S measuring 40 cm by 33 cm by 36 cm contained 33 ℓ of water. Gabriel poured some water from Tank R into Tank S without spilling and the water level of Tank S rose to 32 cm. What was the height of water level left in Tank R?
1 ℓ = 1000 cm³
33 ℓ = 33000 cm³
30.84 ℓ = 30.84 x 1000 = 30840 cm³

Height of water in Tank S at first
= 33000 ÷ 40 ÷ 33
= 25 cm

Increase in the height of water in Tank S
= 32 - 25
= 7 cm

Volume of water poured into Tank S
= 40 x 33 x 7
= 9240 cm³ 

Volume of water left in Tank R
= 30840 - 9240
= 21600 cm³ 

Height of water left in Tank R
= 21600 ÷ 48 ÷ 45
= 10 cm

Answer(s): 10 cm