What is next number in the pattern below:

131 517 192 123 ?

A deaf and mute man goes to the train station. Tickets for the train are 50 cents each. The man goes to the ticket booth and hands the man inside just a dollar. The man in the booth hands him two tickets.

How did the man in the booth know to give him two tickets without even looking at him?

There were two grandmothers and their two granddaughters.
There were two husbands and their two wives.
There were two fathers and their two daughters.
There were two mothers and their two sons.
There were two maidens and their two mothers.
There were two sisters and their two brothers.
Yet there are only six, who are buried here,
All are born legitimate and relationships clear.
How can this happen?

Prove that the below maths equation is true.

8 + 8 = 91

What has to be broken before you can use it?

I am a number I am not an odd number I am higher than 90 I am not higher than 100 If you subtract me from 100, you get nothing. What number am I?

Rearrange the letters in "new door" to make one word.

Look at the picture and find out which square is not linked with any of the other squares.

How many triangles do you see in the picture puzzle below?

How can you drop a raw egg from a height onto a concrete floor without cracking it?