Quantitative Aptitude - Arithmetic Ability Questions

A and B undertake a piece of work for Rs. 250 . A alone can do that work in 5 days and B alone can do that work in 15 days . With the help of C, they finish the work in 3 days . If every one gets paid in proportion to work done by them, the amount C will get is 

12 men or 30 boys can complete a work in 72 days. How many days will 48 men and 24 boys will take to complete the same work?

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

In the following question, select the odd word pair from the given alternatives.

What is the value of Cot 45° - (1/√3)Cosec 60°?

The distance between the points (11,­5) and (k,0) is 13. Find k.

If x + 1x = -2, then the value of x631 + 1x632?

If x = 5 + 15 - 1 & y = 5 - 15 + 1, then find the value of x2 - y2.