Question

A metal parallelopiped of measures $16cm\times 11cm\times 10cm$ was melted to make coins . How many coins were made if the thickness and diameter of each coin was 2 mm and 2 cm respectively.?

Answer 1

Dimensions of pipe = $16cm\times 11cm\times 10cm$
Dimensions of coin $=0.2cm\times 1cm\times 1cm\times \frac{22}{7}$
No of coins = T. Area of pipe / T. Area of one coin
$=\frac{16\times 11\times 10\times 7}{0.2\times 22}$
$=2800$ coins