1.  A Child has 1200 five rupee coins. He wants to place them in such a way that the number of rows and the number of columns remains the same. What is the minimum number of coins that he needs more for this purpose?
A. 125
B. 96
C. 35
D. 25

Answer: Option D

Explanation:

We know that, to be in the form that the number of rows and the number of columns to be equal the number should be a perfect square  

Given number is 1200

The perfect number which is above and near to 1200 is 1225 which is 35 x 35.

The minimum number of coins he need is 25.