Find value of

A room in a house measures 5 m in height and its length is 3 times its breadth. The cost of whitewashing its four walls at Rs. 2.50 per sq m is Rs. 200. What is the cost of carpeting the floor at Rs. 5 per sq m? 

If then find the value of x.

If then the find the value of  

What is the smallest number to be added to 2203, so that we get the sum of a perfect square number?

If then find the value of n.

The value of Let . Then is equal to:

The value lies between