Quantitative Aptitude - Arithmetic Ability Questions

In a week, how many times are the hands of a clock at right angles with each other?

If secA/√(sec2A ­- 1) = x, then value of x is

Mayank, Deepak and Pawan, each of them working alone can complete a work in 5, 10 and 15 days respectively. If all three of them work together to complete a work and earn Rs. 12000 what will be Deepak's share of the earnings?

A and B together can do a piece of work in 36 days, B and C together can do it in 24 days. A and C together can do it in 18 days. The three working together can finish the work in

A mixture of 50 kg of cement and gravel contains 10% of gravel. How many kg of gravel must be added to make the gravel content 28% in the new mixture?

The surface area of a sphere is 1386 cm2.  Find its diameter (in cm)

If cosec π/4 - ­ sin π/3 = x, then the value of x is

ΔABC is right angled at B. If m ∠A = 60°, then what is the value of 1/√3 Cosec C?