Buy me, smell me or deliver me, I do not change.

Who am I?

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

What do you call a fish without an eye?

Can you count the number of quadrilaterals in the picture below?

You need to complete the maze by entering from the entrance marked below in the figure near the yellow circle, bottom left and leaving from the exit point near the green circle, bottom middle.

Rule of Game: You can move only by exchanging green and yellow circles.

Can you find the thief by just looking at the picture below?

In a competitive exam, each correct answer could win you 10 points and each wrong answer could lose you 5 points. You sat in the exam and answered all the 20 questions, which were given in the exam.
When you checked the result, you scored 125 marks on the test.

Can you calculate how many answers given by you were wrong?

Can you find the 09 errors in the picture below?