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?

The average of 19 consecutive even integers is 50. The highest of these integers is

If the perimeter of a semi-circle is 108 cm, then find its radius (in cm).

In a triangle PQR, PX, QY and RZ be altitudes intersecting at O. If PO = 6 cm, PX = 8 cm and QO = 4 cm, then what is the value (in cm) of QY?

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

If 9x - [5(2x + 1)/2] = 9/2, then the value of x is?

What is the smplified value of Sin2A/1+Cos2A ?

To go a distance of 40 km upstream a rower takes 8 hours while it takes her only 5 hours to row the same distance downstream. What was the rower's speed in still water?