Find the square roots of the following fractions:
a) 64/225
b) 400/169

Let’s denote the number of students in the class as z. According to the problem, each student contributed z rupees. Therefore, the total contribution, which is Rs. 1156, can be represented as z × z.

According to the question: 
$$\begin{gathered} z\times z=1156 \\ {z}^2=1156 \\ z=\sqrt{1156} \\ z=34 \end{gathered}$$
So, the strength of the class is 34.