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A bucket is in the form of a frustum of a cone and it can hold 28.49 litres of water. If the radii of its circular ends are 28 cm and 21 cm, find the height of the bucket.

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The correct Answer is:
`15 cm`
r = 21 cm, R = 28 cm.
Volume of the bucket `=(28.49xx1000)cm^(3)`.
`:." "1/3pi[(28)^(2)+(21)^(2)+28xx21]h=28490." Solve for h"`.
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RS AGGARWAL-VOLUME AND SURFACE AREAS OF SOLIDS-Exercise 17C
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