What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

You are presented with three boxes. One of them has a red ball inside and the other two have a black ball inside each of them. You are asked to pick up the one with red ball and you pick one. Now, one of the other boxes is opened and it is found to have a black ball.

You are presented with a chance to change your box with the one that is left closed. Will you change your box? Why or why not?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

What does this rebus riddle means ?

Give it food and it will live; give it water and it will die.

I shave every day, but my beard stays the same. What am I?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

Without looking at a calendar, within a minute name, a boy's name using 5 consecutive 1st letters of 5 consecutive months

A man was going to bleach his socks because they had gotten muddy the day before. As he was pouring the bleach into the washing machine, he spilt some on the floor. He got some cleaning fluid and mopped it up with a rag. Minutes later he was dead. What killed him?

On a bright sunny day, two fathers took their son fishing in the lake. Each man and son were able to catch one fish. When they returned to their camp, there were only three fishes in the basket. What happened?

PS: None of the fish were eaten, lost, or thrown back.