Quantitative Aptitude - Arithmetic Ability Questions

Find the value of  x3 - y3, if x - y = 4 and xy = 12.

Expanded and simplification of (x + 3)(x - 1) will be equal to

The mean of 10 observations is 17. One more observation is included and the new mean becomes 16. The 11th observation is

If 4x - 5y = -37 and 7x + y = -16, then x - y = ______

What is the value of tan 7π/4?

The 3rd and 9th term of an arithmetic progression are -8 and 10 respectively. What is the 16th term?

If x3 + y3 + z3 = 3(1 + xyz), P = y + z – x, Q = z + x – y and R = x + y – z, then what is the value of P3 + Q3 + R3 – 3PQR?

The cash difference between the selling price of an article at a profit of 4% and 6% is Rs. 3. The ratio of two selling prices is: