Quantitative Aptitude - Arithmetic Ability Questions

If tan2A - sin2A = x, then value of x is

A rice trader buys 20 quintals of rice for Rs 8,580. However, 22% rice is lost in transportation. At what rate should he sell to earn 20% profit?

The ratio of present ages of P and Q is 7:9. Before 10 years the ratio of their ages was 5:7. What is Q's present age (in years)?

The price of a product after getting 20% discount is Rs 3,024 which includes 5% tax on selling price. What was the marked price (in Rs) of the product?

A number is increased by 84, it becomes 107% of itself. What is the number?

5 years ago the average age of a family which includes father, mother and a son was 35 years. 3 years ago the average age of father and mother was
46 years. What is the present age (in years) of the son?

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

If the radius of a circle is increased by 14% its area increases by