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

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

You need to move three matchsticks to form three squares. Can you do it?

What animal walks on four legs in the morning, two legs during the day, and three legs in the evening?

Oedipus, the king of Thebes, figured out the answer to the riddle:

While handling a project, the landscaper is asked by the owner of the mansion that he wants four trees in front of his mansion that are exactly equidistant from each other.

How will he do it?

I am sure no one can have two things for dinner. what are they?

What happened when the wheel was invented?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

These types of puzzles are known as charades. What you have to do is find two words that are referred to in the first stanza and the second stanza and put them together to form the third word in the third stanza.

Just for example, if my first refers to 'off' and my second refers to 'ice', then my whole will be office.

My first is present - future's past -
A time in which your lot is cast.

My second is my first of space
Defining people's present place.

My whole describes a lack of site -
A place without length, breadth, or height.

Find the next number in the series below

21 32 54 87 131 ?