There are 2 to 40 minutes on any watch. So how many degree angles will be made between the two needles?

Last year Mr. A bought two paintings. This year he sold them for Rs. 20,000 each. On one, he made a 25 % profit and of the other he had a 25 % loss. Then his net profit or loss is 

Find the value of $$ {\sqrt{4+\sqrt{44+\sqrt{10000}}}}$$.

A Navy captain going away from a lighthouse at the speed of 4[(73) -1] m/s. He observes that it takes him 1 minute to change the angle of elevation of the top of the lighthouse from 60 ° to 45 °. What is the height (in meters) of the lighthouse? 

The cost price of an article is Rs. 480. If it is sold at a profit of 12.5 percent, what will be the selling price of the article?

If the height of a cylinder is increased by 15% and the radius of its base is decreased by 10%, then by what percent will its curved surface area change?

If $$ {(\sqrt {3})^{5}× {9}^{2}={3^{n}{×3\sqrt {3}}}}$$ then value of n