The figure is not drawn to scale. Tank P measuring 50 cm by 43 cm by 25 cm contained 23.69 ℓ of water. Tank Q measuring 40 cm by 27 cm by 35 cm contained 27 ℓ of water. Ken poured some water from Tank P into Tank Q without spilling and the water level of Tank Q rose to 33 cm. What was the height of water level left in Tank P?
1 ℓ = 1000 cm³
27 ℓ = 27000 cm³
23.69 ℓ = 23.69 x 1000 = 23690 cm³

Height of water in Tank Q at first
= 27000 ÷ 40 ÷ 27
= 25 cm

Increase in the height of water in Tank Q
= 33 - 25
= 8 cm

Volume of water poured into Tank Q
= 40 x 27 x 8
= 8640 cm³ 

Volume of water left in Tank P
= 23690 - 8640
= 15050 cm³ 

Height of water left in Tank P
= 15050 ÷ 50 ÷ 43
= 7 cm

Answer(s): 7 cm