List of Mathematical Series Questions for Practice

Chandu bought a watch at 20 percent discount on mark price but sold it at mark price. Find the percentage of profit.

A shopkeeper bought 15 kg of rice at the rate of Rs.29 per kg and 25 kg of rice at the rate of Rs.20 per kg. He sold the mixture of both types of rice at the rate of Rs. 27 per kg. his profit in this transaction is___

A sample of 50 litres of glycerine is found to be adulterated to the extent of 20 % . How much pure glycerine should be added to it so as to bring down the percentage of impurity to 5 %? 

A sum of money placed at compound interest triples itself in 9 year. In how many years will if amount to 243 times itself?

What is a difference between simple interest and compound interest in 1 year at a rate of 10 percent on an amount of Rs. 1200. If interest is half yearly compounded?