Quantitative Aptitude - Arithmetic Ability Questions

Coefficient of x in (x + 9)(8 - 5x) is

If a+b=5 then the value of a-37+b-27 is

At what rate of compound interest (in %) per annum will a sum of Rs. 15,000 become Rs. 18,150 in 2 years?

What is the value of 9991 x 10009?

If Mr. Raghav taught a total of 500 hours, then what is the difference in number of hours of teaching algebra and modern Maths?

The average weight of P, Q and R is 47 kg. If the average weight of P and Q be 32.5 kg and that of Q and R be 48.5 kg, then what is the weight of Q (in kgs)?

A sum becomes Rs 10000 in 10 years on simple interest at the rate of 10% per annum. What is the total interest (in Rs) of the 10 years?

a and b are irrational numbers such that a+b = q is a rational number; then a­b is