Question

If 600 rupees buy 15 bunches of feed, how many will 1280 rupees buy?

Answer 1

Let us suppose x bunches of feed can be bought in 1280 rupees.
The number of bunches of feed and their cost vary in direct proportion.
$$\begin{gathered} \therefore \frac{15}{600}=\frac{x}{1280} \\ \Rightarrow x=\frac{15\times 1280}{600} \end{gathered}$$
= 32
Hence, 32 bunches of feed can be bought in 1280 rupees.