if one of the interior angles of a regular polygon is $$15\over 16$$ times of one of the interior angles of a regular decagon, then the number of diagonal of the polygon is.

A motorboat covers a certain distance downstream in a river in 3 hours. It covers the same distance upstream in 3 and half an hour. If the speed of the water is 1.5 km / h, then the speed of the boat in still water is: 

A straight tree breaks due to storm and the broken part bends so that the top of the tree touches the ground making an angle of 30 ° with the ground. The distance from the foot of the tree to the point, where the top touches the ground is 10m. Find the total height of the tree 

A person invested Rs 28000 at the rate of 8% per annum simple interest and Rs 26000 at the rate of 10% per annum compounded Interest compounded annually. What is the difference in the interest earned from two investments at the end of 3 years? 

The difference of a number consisting of two digits from the number formed by inter changing the digits is always divisible by: 

If 8% of x is the t same as 4 % of y, then 20% of x is the same as:

Study the graph carefully and answer the following questions.

How many state showing above average production in 1992-93 showed below average production in 1993-94 ?