Question

Bucket is in the form of frustom of a cone of height 30cm with radii of its lower and upper ends as 10cm and 20cm respectively find the capacity of and the surface area of the bucket also find the cost of milk required to completely fill the bucket at the rate of rs. 25 per litre use pie 3.14

Answer 1

use volume of frustum,

$\frac{1}{3} \pi \: h( {r1}^{2} + {r2}^{2} + r1r2)$
$\frac{1}{3} \pi30(100 + 400 + 200)$
$10\pi(700)$
$7000 \times 3.14$
$21980 {cm}^{2}$
convert to litres

$\frac{21980}{1000}$
$21.98 \: l$
rounding of 22

Rs=22×25
=550rs

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