When my father was 31 I was 8. Now he is twice as old as me. How old am I?

I start and end with 500 and carry a 5 in my heart. But I require the first letter and the first number to be complete. I am the name of a King.

Who am I ?

In a boat, the father of a sailor's son is sitting with the son of the sailor. However, the sailor is not present on the boat.

Can this even be possible?

Identify the 10 differences between the two given pictures.

A man has eighty-one cows ( numbered 1,2,3...81 as such). The beauty is that cow no. 1 gives 1ltr of milk, cow no. 2 gives 2ltrs of milk and so on. The man wants to equally distribute the cows among his nine sons so that each one of them gets the same quantity of milk.

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

A wooden log balances equally on the scales when weighed with three-quarters of a pound and three-quarters of a wooden log.

Can you calculate the weight of the entire wooden log?

What time is it when an elephant sits on a fence?

What occurs twice in a week, once in a year but never in a day?

What is common among 11, 69, and 88?