Quantitative Aptitude - Arithmetic Ability Questions

Product of digits of a 2-digit number is 72. If we add 9 to the number, the new number obtained is a number formed by interchange of the digits. Find the number.

The value of -261+(-380)-(-521)+821-(-121)

Two numbers are 40% and 50% lesser than a third number. By how much percent is the second number to be enhanced to make it equal to the first number?

The sum of two positive integers is 80 & difference between them is 20. Then what is difference of squares of those numbers ?

What is the value of (1+cosA)/(1-­cosA)?

Rs 9000 is divided among P, Q and R in the ratio of 5 : 6 : 7. What is the share (in Rs) of R?

If the perimeter of a semicircle is 108 cm, then find its area (in cm²).

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