How do you go from 98 to 720 using just one letter?

The ages of a father and son add up to 66.
The father's age is the son's age reversed.
How old could they be?
(3 possible solutions).

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

A journalist was investigating a sacred cult in the jungles of Africa when he was caught by one of the person. He was confined in a cave till the leader arrived. The leader told him that he need to tell him a statement. If he thinks the statement is true, then the journalist head will be chopped off. If he thinks that the statement is false, his head will be smashed with a hammer.

What statement did the journalist make to survive?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

Do you know who was buried in John's tomb?

You are a thief and you are being punished for your crime. People have tied your head down on a tree with a rope that has been anchored in the ground. A candle is burning below the rope which is slowly burning it away. Just below your head, a Lion has been left loose and is waiting for you to drop down on the ground so he can have you as his lunch.

You have to survive the scenario. How will you do it?

Through your logical capabilities, can you make 7 an even?