What is single discount equivalent to two successive discounts of 15% and 20%?

Radius of base of a right circular cone and a sphere is each equal to r. if the sphere and cone have same volume, the what is the height of the cone?

The average of 12 number is 42. If a 13th number is added, then the average becomes 44. What is the 13th number?

By selling an article for Rs. 320, a man incurs a loss of 20%, what should be the selling price of an article to gain 30%?

Pipe A can fill a tank in 6 hours. Pipe B can fill the same tank in 10 hours – pipe A, B, C together can fill the same tank in 12 hours. In how many hours pipe C can fill the tank alone?

Simple interest on a certain sum is equal to the sum itself. find the time if rate of interest and time are numerically equal.

What will be the compound interest on a sum of Rs. 21000 for 2 years at the rate of 14.28% per annum when interest is compound yearly?

If A : B = 3 : 2, then (3A – 2B): (2A – B) is equal to