Quantitative Aptitude - Arithmetic Ability Questions

If √(1 - cos2A)/cosA = x, then the value of x is

An 80 litre mixture of water and acid contains 20% acid. How much acid should be added to make the acid 60% in the new mixture?

From the circumcentre I of the triangle ABC, perpendicular ID is drawn on BC. If ∠BAC = 60°, then the value of ∠BID is

In the given figure, AB, AE, EF, FG and GB are semicircles. AB = 56 cm and AE = EF = FG = GB. What is the area (in sq.cm) of the shaded region?

The rate of working of A and B are in the ratio of 2:3. The number of days taken by them to finish the work is in the ratio:

If (1 - cosA)/2 = x, then the value of x is

ΔPQR is right angled at Q. If cosP = 5/13, then what is the value of cosecR ?

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