# A reservoir in the form of a rectangular parallelopiped is 20 m long. If 18 kl of water is removed from the reservoir, the water level goes down by 15 cm. Find the width of the reservoir.

Let the width of the reservoir = m
Volume of water flowing from the reservoir = l × b × h
= 20 × x × 0.15
= 3x m3
Volume of the water removed = 18 m3 (1m3 = 1000 litre)
Hence 3x = 18 ⇒  x = 6m
∴ Width of the reservoir = 6m

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