Quantitative Aptitude - Arithmetic Ability Questions

The median of the numbers 4, 2, 2, 6, 3 and 8 is

15 years ago, Shyam was twice as old as Prbhat. Five years from now Prabhat's age will be 5/8 of Shyam's age. What is Shyam's current age?

If the line DE is drawn parallel to the base BC of a triangle ABC by intersecting the other two sides, then which of the following is the CORRECT equation for this case.

Δ XYZ is right angled at Y. If m∠Z = 30°. What is the length of YZ (in cm), if ZX = 9 cm?

Pipes A, B and C are attached to an empty cistern. While the first two can fill the cistern in 4 and 10 hrs, respectively, the third can drain the cistern, when filled, in 6 hrs. If all the three pipes are opened simultaneously when the cistern is half-full, how many hours will be needed to fill the cistern?

If the standard deviation of a population is 4.5, what would be the population variance?

Select the odd word/letters/number/number pair from the given alternatives.

Four pairs of words are given below out of which three are alike in some manner and one is different. Which is different from the rest?