One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

Suppose that you are trapped on the surface of a frozen lake. The surface is so smooth and ideal that there is no friction at all. You cant make any grip on the ice and no wind is blowing to help you out. You have just a mobile phone with you which has got no reception disabling you to call for help.

How will you plan your escape before you freeze to death on the frozen lake?

Prove that twice of ten is the same as twice of eleven.

A red house is made out of red bricks. A yellow house is made out of yellow bricks. And, a blue house is made out of blue bricks. So, what is a greenhouse made of?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

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

What Word am I Looking For ?

15 caves are arranged in a circle at the temple of doom. One of these caves has the treasure of gems and wealth. Each day the treasure keepers can move the treasure to an adjacent cave or can keep it in the same cave. Every day two treasure seekers visit the place and have enough time to enter any two caves of their choice.

How do the treasure seekers ensure that they find the treasure in the minimum number of possible days?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

Which is faster, Heat or Cold ? Explain.