Question

If milk is available at Rs per litre, find the cost of litres of milk.

Answer 1

Cost of 1 litre milk = $\text{Rs}.17\frac{3}{4}$
$17\frac{3}{4}=\frac{(17\times 4)+3}{4}=\frac{71}{4}$
$\Rightarrow \mathrm{Cost}\mathrm{of}1\mathrm{litre}\mathrm{milk}=\text{Rs}.\frac{71}{4}$
$$\begin{gathered} 7\frac{2}{5}\mathrm{litres}=\frac{(7\times 5)+2}{5}=\frac{37}{5}\mathrm{litres} \\ \mathrm{Cost}\mathrm{of}\frac{37}{5}\mathrm{litres}\mathrm{milk}=\text{C}\mathrm{ost}\mathrm{of}1\mathrm{litre}\mathrm{milk}\times \frac{37}{5} \\ \mathrm{Cost}\mathrm{of}\frac{37}{5}\mathrm{litres}\mathrm{milk}=\frac{71}{4}\times \frac{37}{5}=\mathrm{Rs}.\frac{2627}{20}=\mathrm{Rs}.131\frac{7}{20} \end{gathered}$$