A number was increased by 20% and then again it was increased by 20%. By what percent should the increased number be reduced so as to get back the original number?
A cylinder of radius 12cm contains water to a depth of 20cm. A spherical iron ball is dropped into the cylinder and thus the level of water is raised by 6.75cm. The radius of the ball is
A and B can complete a work in 12 days, B and C complete a work in 15 days and C and A can complete a work in 20 days. Find in how many days they all together can complete a work?
A car covers 15 km, 20 km, 30 km and 12 km at speeds of 20 km/hr, 30 km/hr, 40 km/hr and 30 km/hr respectively The average speed of the car for the total journey is:
Two cars travel from city A to city B at speeds of 42 km/hr and 60 km/hr respectively. If one car takes 2 hours lesser time than the other car for the journey, then the distance between city A and city B is?