Quantitative Aptitude - Arithmetic Ability Questions

In a college union, there are 48 students. The ratio of the number of boys to the number of girls is 5:3. The number of girls to be added in the union, so that the number of boys to girls in 6:5 is

If a + b = 8 and ab = 15, then what is the value of a3 + b3?

The value of aa-b+bb-a is

Which of the following is correct?

If 2x-12x = 5, then what is the value x2 + 116x2 - 2

If 31x + 31y = 403, then what is the average of x and y?

A number is divided into two parts in such a way that 30% of first part is 25 more than the 20% of second part. 50% of second part is 33.5 more than the 60% of first part. What is the number?

Meghnad can do a piece of work in 45 hours. If he is joined by Jayshri, who is 50% more efficient, in what time will they together finish the work?