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

A travels 20 km with a speed of 40 km/hr. He travels another 45 km with a speed of 15 km/hr. what is his average speed for the entire journey?

A bus can travel $$ 12{2\over5}$$ Km in one hour. How much distance will it cover in $$ 2{3\over4}$$ hours? 

Jack sold a dress for Rs.1440 and made a profit of 20%. What was its cost? 

Fill in the blanks:
Sin A = ____ × (Cos A)