Quantitative Aptitude - Arithmetic Ability Questions

If a - b = -1 and ab = 6, then what is the value of a3- b3?

The income of X is 60% more than Y’s income and the income of Y is 40% more than Z’s income. X’s income is how much percentage more than Z’s income?

If(x + y)2 = xy + 1 and x3 – y3 = 1, then what is the value of x – y?

The circumferences of two circles are touching externally. The distance between their centres is 12 cm. The radius of one circle is 7 cm. Find the diameter(in cm) of the other circle.

What is the reflection of the point (4 , -3) in the line y = 1?

What is the average of all natural numbers from 21 to 39?

Square of (3x – 5xy) is

What is 0.53 + 0.53equal to ?