What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Name a key which is hardest to turn.

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

Can you count the number of triangles in the given picture?

Count the Triangle in the figure given below:

Why did Buffon take the goal with him after every Juventus match?

Jim and Sarah are in a long-distance relationship. Jim buys an engagement ring for Sarah and wants to mail it to her. Unfortunately, the only way to ensure the ring will be received is to place a lock on the package. Jim has locks and Sarah has locks, but neither has keys for each other’s locks. How can they make sure the ring isn’t stolen?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

Can you place three balls such that the equation shown in the picture holds true?

You are given 16 witch hats. The hats are divided in four different colours – red, blue, green and yellow. Every colour has been assigned to four hats. Now each of the hat will be glued with a label of an arithmetic sign – ‘+’, ‘-‘, ‘x’ or ‘/’. But you can label one sign only once on one colour. In such an arrangement, the hats can be uniquely defined by its colour and symbol.

Can you arrange all the 16 hats in a 4x4 grid in a fashion that no two rows and columns have a repetition of colour or sign?
We have arranged four hats in the below picture to assist you.