The more of this there is, the less you see. What is it?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

I cry without having a voice.
I fly without having wings.
I bite without having teeth.
I whisper without a mouth.

Who am I?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

What am I?

A landlord calls both of his sons and tells them that their horses will now decide who will transfer the inheritance. He tells them to race along the land till the end and the one whose horse will be slower will win and be the heir to all the property.

Both of them keep wandering for days but to no result. Then they ask a wise man regarding it. The man advises them on the matter after which they jump on the horses and race as fast as they can till the end. Why did they do it?

What did the wise man say?

Find the value of "?" in the ball picture Riddle below:

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?

Which wheel of car does not rotate when you turn your car right?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"