The figure is not drawn to scale. Tank Q measuring 52 cm by 47 cm by 25 cm contained 29.88 ℓ of water. Tank R measuring 40 cm by 34 cm by 33 cm contained 34 ℓ of water. Howard poured some water from Tank Q into Tank R without spilling and the water level of Tank R rose to 29 cm. What was the height of water level left in Tank Q?
1 ℓ = 1000 cm³
34 ℓ = 34000 cm³
29.88 ℓ = 29.88 x 1000 = 29880 cm³

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

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

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

Volume of water left in Tank Q
= 29880 - 5440
= 24440 cm³ 

Height of water left in Tank Q
= 24440 ÷ 52 ÷ 47
= 10 cm

Answer(s): 10 cm