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?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

The doctor advised his patient to take a tablet after every fifteen minutes. He gave him five tablets in total.

How much time will he take to have all the five tablets?

What has hands, but can’t clap?

what does this picture(rebus) riddle means ?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

Two guards were guarding the camp.Guard-1 was looking towards the south to make sure no threat is coming from the road.Guard-2 was looking at the north to make sure no threat is coming from the top. Suddenly Guard-1 ask the Guard-2 why he is smiling?How Guard-1 knows that Guard-2 is smiling?

How is a fly different from a mosquito?

Find the next number in the series below

21 32 54 87 131 ?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?