Quantitative Aptitude - Arithmetic Ability Questions

Two students appeared for an examination. One of them secured 9 marks more than the other and his marks were 56% of the sum of their marks. The marks obtained by them are

If 2x - 5y = 5 and 2x - y = 9, then x - y is ______.

Let ΔABC and ΔABD be on the same base AB and between the same parallels AB and CD. Then the relation between areas of triangles ABC and ABD will be

What is the value of √[(1 ­- cosA)/(1 + cosA)]?

What is the value of Cot 45° - (1/√3)Cosec 60°?

Find the marked price if the selling price is Rs. 9250 and discount is 7.5%.

Reflection of the point (2,­7) in the y­axis is

If Cot θ = 21/20, then what is the value of Cosec θ?