Question

A shopkeeper allows one toffee free on $5$ toffees purchase. Ankit wanted to get $25$ toffees free. Find how many toffees should he purchase to get these free toffees.

Answer 1

Let he purchase $x$,

$$\begin{gathered} 1:5=25:x \\ x=5\times 25 \\ x=125 \end{gathered}$$

Hence he purchase $125$