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The volume of a cylindrical tank having 7 metre diameter is 770 cubic metres, then find height of the tank.

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answer is C.

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Detailed Solution

Concept- Use the formula for volume of cylinder where radius and volume of the cylinder is given so we can find height of the cylinder.
(R = radius, h = height) = r2h, where r = radius
Radius =

\frac{d}{2}

\frac{7}{2}

=π

r^{2}

h
770=

\frac{22}{7} \times \frac{7}{2} \times \frac{7}{2} \times

h
770=11(

\frac{7}{2}

) h
h=20m.
Hence, the correct option is 3.

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