What is common among 11, 69, and 88?

Count the number of triangles in the given picture.

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?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

See the given image carefully. What you have to do is move the blue checkers in the position of the black checkers and vice versa. You are only allowed to move the checker to an adjacent empty space. Do it in the least possible moves.

What kind of band never plays music?

You have to fill the below given grid in a manner that every row and column contains the digits 1 to 6. Also, make sure that the squares that are connected with each other must contains the same digit.

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

Which fur should we be getting from the Lion?

Keyboard words are not in alphabetical order, Why?