If ABC is an equilateral triangle and P, Q, R respectively denote the middle points of AB, BC, CA, then 

The value of $$ cos {20^o} cos {40^o}cos {60^o}cos {80^o}$$ is:

The total of the ages of Kiran, Shantanu and Saransh is 93 years. Ten years ago, the respective ratio of their ages was 2 : 3 : 4 . What is the present age of Saransh?

A glass jar contains 6 white, 8 black, 4 red and 3 blue marbles. If a single marble is chosen at random from the jar, what is the probability that it is black or blue?

The simple interest on a sum of money for 3 years is ₹240 and the compound interest on the same sum, at the same rate  for 2 years is ₹170. The rate of interest is 

If 12 men and 16 boys can do a piece of work in 5 days; 13 men and 24 boys can do it in 4 days, then the ratio of the daily work done by a man to that of a boy is 

A circular park whose diameter is 210 m has a 5 m wide path running around it(on the outside). What is the area ( in m²) of the path?

The selling price of 5 articles is the same as the cost price of 3 articles. The gain or loss is