There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

Andrew’s doctor gives him three pills and tells him to take one every half hour. How much time will have passed by the time Andrew’s taken all three pills?

John and Jenni are a married couple. They have two kids, one of them is a girl. Assume safely that the probability of each gender is 1/2.
What is the probability that the other kid is also a girl?

Hint: It is not 1/2 as you would first think.

The LCD device should be able to tell the right time in the format HH:MM: SS in a 12-hour format. You can refer to the picture to get an idea. The device is a simple "level indicator" which has to be converted into a watch. How will you program it to work?

Find the missing number in the sequence.

3 5/3 7/5 11/7 ? 17/11

What goes up but never comes down?

Can you identify the famous TV character from the rebus below?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

A sundial has the fewest moving parts of any timepiece. Which has the most?

Solve the rebus riddle in the picture below.