Quantitative Aptitude - Arithmetic Ability Questions

Find the odd words/letter/number from the given alternatives:

Choose the one which is different or odd from the following options?

Determine the value of a/b + b/a when a + b = 8 and ab = 4.

Find the sum of interior angles of a decagon?

In which quadrant, will the point (4, -2) be located?

A number was divided in the ratio 3:2. When 8 was was added to each of the numbers the ratio changed to 7:5. The greater of the two numbers was

What smallest number should be added to the sum of squares of 15 and 14, so that the resulting number is a perfect square?

The diagonal of a square is 10 cm. What is the length (in cm) of its side?