Quantitative Aptitude - Arithmetic Ability Questions

What is the simplified value of (cosec A + sin A)(cosec A – sin A)?

The height and the total surface area of a right circular cylinder are 4 cm and 8π sq.cm. respectively. The radius of the base of cylinder is

Average age of 6 boys is 14 years. Average age of 11 girls is 12 years. What is the average age (in years) of all boys and girls?

A batsman makes a score of 111 runs in the 10th match and thus increases his average runs per match by 5. What will be his average after the 10th match?

A train is moving with uniform speed crosses two tunnels of lengths 270 metres and 450 metres in 12 seconds and 15 seconds respectively. What is the speed (in km/hr) of the train?

If A purchase 9 chairs for Rs 5 and sells all the chairs at the rate of 5 chairs for Rs 9, then what will be the profit percentage?

The ratio of two numbers is 5 : 9 and their difference is 44. What will be the smaller number among both the numbers?

What is the diameter (in cm) of a sphere of surface area 154 sq cm?