In a class the average age of both male and female students together is 18 years. The total age of these 15 female students is 240. Definitely how many male students are there in a class ?

What are the respective ratio between profit earned by the businessman in 2003 and 2006 together and loss incurred by him in 2002 and 2005 together ?

What is the approximate percent profit earned by the businessman in 2004 and 2007 together?

The respective ratio of expenditure of a businessman in 2003 and 2008 was 7:13. If the earned a profit of 19% in 2008, what was his income in that particular year ?

What is the percent loss incurred by the businessman in 2002and 2005 together?

What is the average profit earned by the businessman in 2001,2003,2004,2006 and 2007 together?