Quantitative Aptitude - Arithmetic Ability Questions

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

Select the odd number from the given alternatives.

At 10% discount the selling price of an article is Rs 4500, what is the selling price (in Rs) if the discount is 27.5%?

If 3a+4b3c+4d = 3a-4b3c-4d, then 

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

If sum of the roots of a quadratic equation is ­-7 and product of the roots is 12. Find the quadratic equation.

In ΔABC measure of angle B is 90 deg. If cosA = 5/13, and AB = 10 cm, then what is the length (in cm) of side BC?

Among three numbers, the first is twice the second and thrice the third. If the average of three numbers is 198, then what is the difference between the first and the third number?