Quantitative Aptitude - Arithmetic Ability Questions

A can complete a task alone in 8 days, while B takes 12 days to do it by herself. Together with C it takes them 4 days to complete the work. If C and D together can complete the task in 15 days, then how many days will D need to complete the task by herself?

Manish, Mukesh and Sachin are Accountants. Mukesh can filea return in 5 hours and Sachin in 4 hours alone. All three together can do it in 2 hours. In what time (in hrs) will Manish do the work?

A man travelled a distance of 99 km in 9 hours. He travelled partly on foot @ 9 km/hr and partly on bicycle @ 18 km/hr. What is distance (in kms) travelled on foot?

If x + y = 10 and x2 + y2 = 68, then find xy

What is the value of cosec -7π/6?

The mean of 20 observations is 19. One more observation is included and the new mean becomes 20. The 21st observation is

In the following question, select the odd letters from the given alternatives.

If 1/(cosecA ­ cotA) = x, then the value of x is