Can you find a number that lies one third of the distance between 1/3 and 2/3?

Can you replace the question mark with the correct number in the below table sequence?

What has many keys but can’t open a single lock?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

In an Art Gallary, When the clock hit 11 am, Artist hung the painting number 30. When it struck 4 pm, he hung painting number 240 and when it struck 7:30 pm, he hung painting number 315.

Can you determine, which painting number will he hang when the time is 9:20 pm?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

How many letters are in the alphabet?

I ask Joseph to pick any 5 cards out of a deck with no Jokers.

He can inspect then shuffle the deck before picking any five cards. He picks out 5 cards then hands them to me (Jack can't see any of this). I look at the cards and I pick 1 card out and give it back to Joseph. I then arrange the other four cards in a special way, and give those 4 cards all face down, and in a neat pile, to Jack.

Jack looks at the 4 cards i gave him, and says out loud which card Joseph is holding (suit and number). How?

The solution uses pure logic, not sleight of hand. All Jack needs to know is the order of the cards and what is on their face, nothing more.

Find the next number in the sequence

1, 2, 6, 21, 88, __?