A person bought 15 kg of rice at the rate of Rs. 34 per kg and 30 kg of rice at the rate of Rs. 27 per kg. He mixed the two types of rice and sold the mixture at the rate of Rs. 32 per kg. What is his gain per cent? (Answer in approximate value)

In an examination, a candidate must get 65% marks to pass. If a candidate scores 303 marks and is declared failed by 35 marks, then what is the maximum marks?

The difference between the present age of A and of B is 32 years. If 6 years ago their ages were in the ratio of 3 : 1, then what is the present age of B?

A certain number of men can do a piece of work in 40 days. If there had been 8 men more it could have been finished in 5 days less. Find the number of men