Quantitative Aptitude - Arithmetic Ability Questions

A book seller allowed 10% discount on printed price. He gets 30% commission from publisher. His profit in percent will be

The sum of the ages of father and son at present is 33. Two years ago the product of their ages was 28. What is the age of the father and the son?

The average of 100 items was found to be 30 . If at the time of calculation , two items were wrongly taken as 32 and 12 instead of 23 and 11 , then the correct average is

Select the odd word/letters/number/number pair from the given alternatives.

If 2cosec2A = x, then the value of x is

If 1/(cosecA ­ cotA) = x, then the value of x is

To cover a distance of 252 km in 2.5 hours what should be the average speed of the car in meters/second?