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? 

The value of   of 2.80 is:

If then the find the value of  

  The value of is

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

√60+√10+√36=?

Find the square root of (272² - 128²).

If x + 1/√x = 6 then x² + 1/x² is equal to :-