Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

Find the number of squares in the below-given picture.

Out of four images which one is the odd one out?

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

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

You are given a cube that is made with the help of 10x10x10 smaller cubes summing up to a total of 1000 smaller cubes. You are asked to take off one layer of the cubes.
How many remain now?

What goes up but never comes down?

How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

Replace the question mark with the correct number in the below-given picture?

What is red and smells like blue paint?