John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

Two fathers and two sons decided to go to a shop and buy some sweets upon reaching. Each of them bought 1 kg of sweet. All of them returned home after some time and found out that they had 3kg of sweets with them.

They did not eat the sweets in the way, nor threw or lose anything. Then, how can this be possible?

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

There is a box full of marbles,
all but two are blue,
all but two are green,
and all but two are red.

How many marbles are in the box?

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

I know a 5-digit number having a property that With a 1 after it, it is three times as large as it would be with a one before it.

Guess the number?

Keyboard words are not in alphabetical order, Why?

Why is 6 afraid of 7?

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

What are the 50th, 63rd and 100th numbers in the sequence below?
4, 5, 8, 8, 9, 9, 12, 13, 13, 13, 17, 18, ...