# A reservoir is in the form of a rectangular parallelopiped (cuboid ) . Its length is 20m . if 18 kl of water is removed from the reservoir , the water level goes down by 15 cm . Find the width of the reservoir (1 kl = 1 m^3)

Solution :  Let the width of the resevoir be $x$ metre . If , 18 kl of water is removed from the reservoir , the water  level gose  down by $15 cm =0.15m$

$\therefore$                 Volume of the water removed from the reservoir $=$ $(20\times x \times 0.15)m^3=3x$  $m^3$

Also ,          Volume of the water removed from the reservoir =18kl =18 $m^3$

$\therefore$              $3x=18\Rightarrow x=6$

Hence , the width of the reservoir is 6 m.

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