A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

It's a test that will check your IQ.

Suppose you have one 11 minute hourglass and one 13 minute hourglass.

Can you measure exactly fifteen minutes using them ?

If a zookeeper had 100 pairs of animals in her zoo, and two pairs of babies are born for each one of the original animals, then (sadly) 23 animals don’t survive, how many animals do you have left in total?

What does this rebus photo means?

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?

Two boys wish to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross using the boat.

How?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

Can you identify the hidden rebus in the image below?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

Replace all '*' with digits 1, 2, 3, 4, 5 and 6 to make below statement true.

* *
x *
=====
* * *