Quantitative Aptitude - Arithmetic Ability Questions

What will be the net discount percentage of three successive discounts of 20%, 10% and 30%?

If 3x - 10 = -(2x + 5), then the numerical value of (x - 4)3 is

If a - b = 2 and ab = 24, then what is the value of a3- b3?

If 4x2= 152- 92, then value of x is

The mean of 20 observations is 19. One more observation is included and the new mean becomes 20. The 21st observation is

If compound interest received on a certain amount in the 3rd year is Rs. 12,100, what will be the compound interest (in Rs) for the 4th year on the same amount if rate of interest is 9%?

If 35% of (x + y) = 40% of (x – y), then x is what percentage of y?

An engineering student has to secure 25% marks to pass. He gets 47 and fails by 43 marks. What are the maximum marks of the examination?