If the simple interest on a certain sum of money for 2 years in one fifth of the Principal, then find rate of interest per annum. 

9 persons are seated around a round table. What is the probability that two particular persons sit together?

$$ \sqrt{749}×0.56+14.38=?$$

If diagonals of a rhombus are 16 cm and 30 cm. then what is the perimeter (in cm) of the rhombus?

Milkman has a container filled with a mixture of milk and water which are in the ratio of 7 : 3. How many parts of the mixture needs to be removed and replaced from the water to obtain milk and water in ratio of 1 : 1?

If (2, 0) is a solution of the linear equation 2x + 3y = 5, then the value of k is: 

Find out value of Cosec $$\left(-{5π\over3} \right)$$?

The average of nine numbers is 50. The average of first five numbers is 54 and that of the last three numbers is 52, then the sixth number is -