The figure is not drawn to scale. Tank K measuring 52 cm by 41 cm by 25 cm contained 11.7 ℓ of water. Tank L measuring 40 cm by 26 cm by 34 cm contained 26 ℓ of water. Vaidev poured some water from Tank K into Tank L without spilling and the water level of Tank L rose to 26 cm. What was the height of water level left in Tank K?
1 ℓ = 1000 cm³
26 ℓ = 26000 cm³
11.7 ℓ = 11.7 x 1000 = 11700 cm³

Height of water in Tank L at first
= 26000 ÷ 40 ÷ 26
= 25 cm

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

Volume of water poured into Tank L
= 40 x 26 x 1
= 1040 cm³ 

Volume of water left in Tank K
= 11700 - 1040
= 10660 cm³ 

Height of water left in Tank K
= 10660 ÷ 52 ÷ 41
= 5 cm

Answer(s): 5 cm