I travel all around the world but always stay in the corner. What am I?

In a box, there is a jumble of 7 red balls, 6 blue balls, 5 green balls, and 4 yellow balls. What is the minimum number of balls, will you have to pick up so that you have at least 4 balls of the same colour?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

Replace The Question Mark Below With the Correct Number.

2 {38} 3
4 {1524} 5
6 {3548} 7
8 {????} 9

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

A King wants to send the diamond ring to his girlfriend securely. He got multiple locks and their corresponding keys. His girlfriend does not have any keys to these locks and if he sends the key without a lock, the key can be copied in the way. How can King send the ring to his girlfriend securely?

In a concert, Christina is performing a dance show with her group.
At 10:00, she and her crew were dancing in an absolutely straight line. At that time Christina was standing in 4th position from both the front and back end of the row.

What was the size of her crew?

It belongs to you, but other people use it more than you do. What is it?

Can you name four days which start with the letter 'T'?