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A conical vessel with vertex downward contains water to a depth of 5 cm. On adding 720 cm of water the level voice to 10cm. find the quantity of water which must be added is Outer that the level may rise to 15 cm.

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720 cm2

720 cm3

700 cm

720 cm

answer is A.

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Detailed Solution

Vertex downward is 5 cm
Volume of the cone Is

Therefore, the volume of the given conical vessel

It is given that when we add 720 cm are of we, the level rises to 10 cm.
Therefore, mathematically, we can write it as

On further simplification

On subtracting

According both side by 5, we get

On subtracting the equating

…(1)
Hew me weed to find the quantity of water which must be added sucks that the level rises to 15 cm
Let the required volume of added water be V.
Therefore, mathematically, we can write the given condition as

Now, we will substitute this value V = 5 × 144 = 720cm3

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