The figure is not drawn to scale. Tank N measuring 50 cm by 46 cm by 25 cm contained 12.94 ℓ of water. Tank P measuring 45 cm by 32 cm by 37 cm contained 36 ℓ of water. Lee poured some water from Tank N into Tank P without spilling and the water level of Tank P rose to 26 cm. What was the height of water level left in Tank N?
1 ℓ = 1000 cm³
36 ℓ = 36000 cm³
12.94 ℓ = 12.94 x 1000 = 12940 cm³

Height of water in Tank P at first
= 36000 ÷ 45 ÷ 32
= 25 cm

Increase in the height of water in Tank P
= 26 - 25
= 1 cm

Volume of water poured into Tank P
= 45 x 32 x 1
= 1440 cm³ 

Volume of water left in Tank N
= 12940 - 1440
= 11500 cm³ 

Height of water left in Tank N
= 11500 ÷ 50 ÷ 46
= 5 cm

Answer(s): 5 cm