If the cost of a notebook is Rs 8 3/4, how many notebooks can be purchased for Rs 131 1/4.

Dear student,
 Given that,
Cost of one notebook = $\frac{35}{4}$
Amount for total number of book is $\frac{525}{4}$

then,
According to the question,
$$\begin{gathered} =\frac{525}{4} ÷ \frac{35}{4} \\ =\frac{525}{4} * \frac{4}{35} \\ =\frac{525}{35} \\ =15 \end{gathered}$$
Now,
Number of Notebooks=15

Regards