If cosec 39°= x, the value of $$ {1\over {cosec^{2}{51°}}} +sin^{2} 39^{°}+tan^{2}{51^{°}}-{1\over {sin^{2}{51^{°}}}{Sec^{2}{39^{°}}}}$$ is-

16 children are to be divided into two group A and B consisting of 10 and 6 children. The average percent marks obtained by the children of Group A is 75 and the average percent marks of all the 16 children is 76. What is the average percent marks of children of Group B?

The population of a village was 9600. In a year, with the increase in population of males by 8 % and that of females by 5 %, the population of the village became 10272. What was the number of males in the village before increase?

If the radius of a right circular cylinder is decreased by 50% and its height is increased by 60%, its volume will be decreased by

A, B and C enter into a partner ship with capitals in the ratio 5 : 6 :8. At the end of business term, they received the profits in the ratio 5 : 3 :12. Find the ratio of time for which they contributed their capitals?

At present, the sum of the ages of A, B and C is 150 years, whereas 10 years ago, the ratio of their age was 5:4:3. Find the ratio of their ages 10 years hence.

Abhishek started from a point A and walked 15 meters to wards south. He turned left and walked 20 meters. He then turned left again and walked 15 meters. He again turned left and walked 35 meters and reached a point B. How far and in which direction is point B with respect to point 'A' ? 

Starting from house Abhijit walked 30 meters in North west direction. Then he walked 30 m. in south - west direction. Then he walked 30 m. in north - east direction. Now he is how much distance away from his house.