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 one letter and starts with an E?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

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

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

How many triangles are there on the puzzle below?

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

In the picture given below, can you find out which digit will take place of the question mark?