Quantitative Aptitude - Arithmetic Ability Questions

The sum of digits of a two-digit number is 9. When the digits are reversed, the number decreases by 45. Find the changed number.

If  x=2+32-3, then what is the value of x+1/x ?

Find the volume (in cm3) of a cube of side 7.5 cm.

The perimeter of a square is 30 cm. Find its area (in cm²).

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

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

When a number is increased by 42, it becomes 121% of itself. What is the number?

$$\begin{gathered} If (x – 2)2 + (y + 3)2 + (z – 15)2 = 0, then what is the value of \\ x + y + z – 5? \end{gathered}$$