Quantitative Aptitude - Arithmetic Ability Questions

What is the average of first 39 even numbers ?

A man bought 500 metres of electronic wire at 50 paise per metre. He sold 50% of it at a profit of 5%. At what percent should he sell the remainder so as to gain 10% on the whole transaction?

A man buys a table and a chair for Rs. 500. He sells the table at a loss of 10% and the chair at a gain of 10%. He still gains Rs.10 on the whole. The cost price of chair in rupees is

What is the value of sin (630 + A) + cos A?

A man spend 7.5% of his money and after spending 75% of the remaining, he had Rs. 370 left. How much money did he have

45 men or 60 boys can do a piece of work in 20 days. How many days will 15 men and 20 boys take to complete the work?

The sum of ages of Ram and his son is 48. If his uncle's age is also included the average becomes 40. What is the age of Ram's uncle?

6 times a fraction is greater than 7 times its reciprocal by 11. What is the fraction?