13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

A kind heart person buy packed food at 3$/packet from United states and sells them at 1$/packet at Africa. After some time he becomes a millionaire.

How come the guy become millionaire ?

Divide 110 into two parts so that one will be 150 per cent of the other. What are the 2 numbers?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

How could a baby fall out of a twenty-story building onto the ground and live?

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

There is a brick of gold and a brick of iron in a boat (both 10-inch blocks), if they are both dropped into the water which will make the water level higher?

Which flower has two lips?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

Alpha is Beta's sister.

Gamma is a Beta mother.

Delta is Gamma's father.

Tango is Delta's mother.

Then,

How is Alpha related to Delta?