A reservoir in the form of cuboid is $50 m$ long. If $20 k l$ water is removed from the reservoir, water level goes down by $10 c m$ . Find the width of the reservoir.

$3 m$

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$4 m$

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$5 m$

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$6 m$

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Solution

The correct option is B
$4 m$

Length of the resevoir, $l = 50 m$

Let the width of the reservoir be $b$

Level of water goes down by $10 c m = 0.1 m$

$\Rightarrow$ Volume of the water flowing out of the reservoir $= l \times b \times level of water$

$= 50 \times b \times 0.1 = 5 b$

Volume of water removed $= 20 k l = 20 m^{3}$ [ $∵ 1 m^{3} = 1000 l$ ]

Hence, $5 b = 20$

$\Rightarrow b = \frac{20}{5} = 4 m$

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A reservoir in the form of cuboid is 50 m long. If 20 kl water is removed from the reservoir, water level goes down by 10 cm. Find the width of the reservoir.

A reservoir in the form of cuboid is $50 m$ long. If $20 k l$ water is removed from the reservoir, water level goes down by $10 c m$ . Find the width of the reservoir.