A student scores 35% and fails by 60 marks while another scores 60% marks and get 40 marks more than the minimum marks required to pass the exam. Find the maximum marks for the examination.

The difference between the present age of a father and that of a son is 30 years. If 16 years ago their ages were in the ratio 5 : 2, how old is the son at present ?

The average age of all the students of a class is 15 years. The average age of the boys of the class is 18 years, and that of the girls is 12 years. If the number of girls in the class is 21, then what is the number of boys in the class ?

Ifa seller wants to earn 12% profit on an item after offering 20% discount to the customer, by what percentage should he increase his marked price to arrive at the label price ?

If the percentage profits of 'A and ' B ' are the same in 2003 and the expenditure of 'A' is Rs 48 lakhs, what is the expenditure o f ' B ' (in Rs) in the same year ?