using four eights (8) and a one (1) and one mathematical symbol , create the number 100

What's the only room from which no one can enter or leave

In the figure, you can see nine stars. What you have to do is connect all of them by using just four line and without lifting your hand i.e. in a continuous flow.

Two trains start at the same time, one from Bangalore to Mysore and the other from Mysore to Bangalore. if they arrive at their destinations one hour and four hours respectively after passing one another, how much faster is one train running than the other?

A bag contains 64 balls of eight different colours. There are eight of each colour (including red). What is the least number you would have to pick, without looking, to be sure of selecting 3 red balls?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

What does Alexander the Great and Winnie the Pooh have in common?

Which is the rope you never skip with?

John speaks the truth only once a day in a week. Below are a few hints for you:

First: Days are Sunday, Monday and so on.
Second: One day he says, "I lie on Monday and Tuesday".
Third: On the next day, he says, "Today is either Thursday, Saturday or Sunday".
Fourth: On the next day, he says, "I lie on Wednesday and Friday".

Can you identify the day on which he speaks the truth?