What is next number in the pattern below:

131 517 192 123 ?

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

If Bihan is 10, Anirudha is 20, and Kim and Seal are both 5, but Rikold is 10, how much is Kenniger by the same trend?

What has no start, end, or centre?

You can find some missing letters in the picture. By placing two particular letters in the spaces, you can form a nine lettered word beginning from one of the corners and going clockwise direction to the middle. Can you find out the letters and the word?

A cricket has 6 legs, a squirrel has 4 legs and a spider has 8 legs.

In a local zoo, it was found that the total number of legs is 612. Also, there are equal number of each of the above animals/insects.

Can you find out how many animals are there in the zoo?

What is the difference between a jeweller and a jailer?

A sundial has the fewest moving parts of any timepiece. Which has the most?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?