Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

Can you start the fire using two pieces of wood?

Can you tell a 3D object that has just two surfaces?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

Suppose you are sitting in an interview and the interviewee asks you an aptitude question.

You have three buckets with a capacity of 4 litres, 8 litres and 10 litres and you have a large tank of water. Now you have to measure 3 litres of water precisely using those buckets. How will you do it?

You need to arrange three 7 and mathematical symbols to form number 1?

Can you find the mistake in the below statement?

The chance of Mr John winning the lottery is 10%. All participants lined up and Mr John is 4th in the row. The first three participants lose the lottery.

What is the chance of Mr John now?

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I