What is next number in the pattern below:

131 517 192 123 ?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

Prove that the below maths equation is true.

8 + 8 = 91

What word is pronounced the same if you take away four of its five letters?

It is raining today at 11:59 am. What is the probability of sunny weather after 72 hours?

A container contains 100 eggs. They can be either fresh or rotten. What is sure is the fact that there is at least one fresh egg in that container.

If you are asked to pick two eggs randomly from the container, at least one of them will be rotten.

Can you calculate how many eggs in that container are fresh?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

A large water tank has two inlet pipes (a large one and a small one) and one outlet pipe. It takes 3 hours to fill the tank with the large inlet pipe. On the other hand, it takes 6 hours to fill the tank with the small inlet pipe. The outlet pipe allows the full tank to be emptied in 9 hours.

What fraction of the tank (initially empty) will be filled in 0.64 hours if all three pipes are in operation? Give your answer to two decimal places (e.g., 0.25, 0.5, or 0.75).

How many triangles can you count in the figure given?

Who has married many women but was never married?