Quantitative Aptitude - Arithmetic Ability Questions

At 5% simple interest per annum a certain sum yields a total amount of Rs. 2,790 at the end of 3 1/4 years. The sum invested was

If x + y = 3, then what is the value of x3 + y3 + 9xy?

What is the difference between the maturity values, if Rs. 12500 is invested for 2 years at 20% per annum simple interest and compound interest?

If 3+12=x+3y, then the x+y is 

If a+1a2 = 3, then the value of  a3+1a3 is

The mean of a distribution is 18 and the standard deviation is 4.5. What is the value of the coefficient of variation?

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

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