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?

I know there are two methods by using three time the same number with a plus(+) operator , you can make sum as 60.

One of them is 20+20+20.

whats the other way ?

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

Count the number of triangles in the picture below:

It's pretty hard to give up.
If you remove a part of it, you will be left with a bit.
Even if you remove another part, the bit still remains.
Remove one more and it still remains.

What is it?

Before Mount Everest was discovered, what was the highest mountain in the world?

A deaf and mute man goes to the train station. Tickets for the train are 50 cents each. The man goes to the ticket booth and hands the man inside just a dollar. The man in the booth hands him two tickets.

How did the man in the booth know to give him two tickets without even looking at him?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

With the help clues provided in the image, can you find the 5 digit key?

Be active and find the killer in the picture Riddle below.