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1. A bucket is in the from of a frustum of a cone and holds 28.490 litres of water. The radii of the top and bottom are 28 cm and 21 cm respectively. Find the height of the bucket.

A. 15 cm

B. 20 cm

C. 25 cm

D. 30 cm

Solution:

Volume of bucket :
= 28.490 litres
= (28.490 ×1000) cm³
= 28490 cm³
Let the height of the bucket be h cm
We have : r = 21 cm. and R = 28 cm

∴ \frac{π}{3} h [{(28)}^{2} + {(21)}^{2} + 28 \times 21]

= 28490

\Rightarrow h (784 + 441 + 588) =

\frac{28490 \times 21}{22}

\begin{aligned} \Rightarrow 1813 h = 27195 \\ \Rightarrow h = \frac{27195}{1813} \\ \Rightarrow h = 15 c m \end{aligned}

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