Quantitative Aptitude - Arithmetic Ability Questions

If 3+12=x+3y, then the x+y is 

The co-ordinates of the centroid of a triangle ABC are (3,-2). What are the co-ordinates of vertex C if co-ordinates of A and B are (-2,5) and (6,-2) respectively?

The compound interest on Rs. 24000 at 10% per annum for 11⁄2 years, interest being compounded semi­annually is

What is the value of sec2θ + 1sec2θ - 1 x 12cotθ - tanθ ?

A sum fetched a total simple interest of Rs. 7728 at the rate of 7% per year in 8 years. What is the sum?

A can do a work in 16 days and B in 20 days. If they work on it together for 8 days, then what fraction of work is left?

What is the value of 5/9 + 7/8?

A product was sold foe Rs. 4,500 at a profit of 12.5%. What was the amount of profit?