Quantitative Aptitude - Arithmetic Ability Questions

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

If (8x ­- 4) = (3x + 6), then the numerical value of (x + 1)3 is

In a class, there were 9 boys and some girls. In a test the mean score obtained by the boys was 12 while that obtained by the girls was 14. If the overall average was 13.1, what was the total number of students in the calss?

Surya works 3 times as fast as Ramya and is able to complete a work in 40 days less than the number of days taken by Ramya. Find the time in which they can complete the work together.

What should be the missing digit so that the number 347_547 becomes exactly divisible by 11?

What is the average of all numbers between 11 and 80 which are divisible by 6?

What is the value of x3-1x3+8 when 8x-8x-16=0 ?

If 5x + 6(3-2x) = 4, then what is the value of x?