Quantitative Aptitude - Arithmetic Ability Questions

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

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

If (-1/2) * ( x - 5) + 3 = -5/2, then what is the value of x?

What is the simplest form of (1 + cosA)(cosecA ­ cotA)?

Simplify (b5x2a3z4)*(b3x2a4z5) / (a2b3z2)

The distance between the points (4, 8) and (k,-4) is 13. What is the value of k?

A can do a piece of work in 8 days and B can do it in 10 days seperately. How many days would it take for both A and B to finish the same work together?

Two numbers are 35% and 40% lesser than a third number. By how much percent is the second number to be enhanced to make it equal to the first number?