Quantitative Aptitude - Arithmetic Ability Questions

What is the reflection of the point (5, -2) in the line y = -1?

Dealer purchased an article for Rs. 900 and fixes the list price in such a way that he gains 20% after allowing 10% discount, then the list price is

A water tank is 2/5 th full. Inlet A can fill the tank in 12 minutes while an outlet pipe B can empty it in 6minutes. If both the pipes are open, how long will it take to empty or fill the tank completely?

The distance between the points (7,7) and (k,-5) is 13. Find k?

If 2+aa + 2+bb + 2+cc = 4, then the value of ab+bc+caabc is

Four pairs of words are given. Find the odd one out.

If cosx.cosy + sinx.siny = -1 then cosx + cosy is

If (X/4) = (Y/5) = (Z/9), then what is X : Y : Z?