Count the number of triangles in the below picture?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

You are stuck on an island where you have nothing. You find four pieces of paper somewhere on the island. What will be your strategy to escape from the island safely?

PS: No other resource is available to you on the island, neither can you build anything.

What is next number in the pattern below:

131 517 192 123 ?

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?

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

Something Extraordinary happened on May 6th 19778 at 12:34am what was that?

What does this rebus mean?

O
N
C
E
TIME

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?