Quantitative Aptitude - Arithmetic Ability Questions

An object travels 23 m in 3 s and then another 15 m in 2 s. What is the average speed of the object?

PQR is a right angled triangle in which PQ = QR. If the hypotenuse of the triangle is 20 cm, then what is the area (in cm2) of the triangle PQR?

If xy = -18 and x2+ y2= 85, then find the value of (x + y).

If (x+a) is the H.C.F of 2x2+5x-12 and x2+x-12 then find the value of a.

If ab+ba = -1, then the value of a2b-b2a is

Shams invested Rs. 5000 at 10% per annum compound interest. After n years, Shams received Rs. 1655 more. Find the value of n.

A number is decreased by 10% and the resulting number is again decreased by 20%. What is the final percentage of decrease?

The sum of 6xy(2x - 4z) , 3yz(2x - 3z) and 4xz(3y - 2y2) is