Quantitative Aptitude - Arithmetic Ability Questions

The mean of 10 observations is 17. One more observation is included and the new mean becomes 16. The 11th observation is

Which one of the following is the minimum value of the sum of two integers whose product is 24?

The sum of all prime numbers between 58 and 62 is

Raghuram sells a machine for Rs 43 lakhs at a loss. Had he sold it for Rs 53 lakh, his gain would have been 7 times the former loss. Find the cost price of the machine.

If a - b = 4 and ab = -3, then what is the value of a3- b3?

Consider two-digit numbers which remain the same when the digits interchange their positions. What is the average of such two-digit numbers?

Area of 4 walls of a cuboid 400 sq cm, its length is 15 cm and height is 8 cm. What is its breadth (in cm)?

If the perimeter of a semicircle is 36 cm, then find its area (in cm2).