What is next number in the pattern below:

131 517 192 123 ?

Find out which of the given views in the picture is accurately the top view of the given pyramid.

Two natural numbers have a sum of less than 100 and are greater than one.

John knows the product of the numbers and Jacob knows the sum of numbers.

The following conversation takes place between them:
John: 'I am not aware of those numbers.'
Jacob: 'I knew you wouldn't be. I am not aware myself.'
John: 'Now I know them!'
Jacob: 'Now I know them, too!'

What are the two numbers?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

It's pretty hard to give up.
If you remove a part of it, you will be left with a bit.
Even if you remove another part, the bit still remains.
Remove one more and it still remains.

What is it?

In the following series, a set of numbers is progressing with a particular pattern. Can you deduce that pattern and find the missing set?

(2 + 6), (21 + 6), (58 + 6), (119 + 6), ___

Can you tell a 3D object that has just two surfaces?

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

Count the number of triangles in the below picture?