How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

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.

If it took eight men ten hours to build a wall, how long would it take four men to build it?

A convention is held where all the big logicians are summoned. The master places a band on everyone's forehead. Now all of them can see others bands but can't see his own. Then they are told that there are different colours of bands. All the logicians sit in circle and they are further explained that a bell will ring at regular intervals. The moment when a logician knew the colour of band on his forehead, he will leave at the next bell. If anyone leaves at the wrong bell, he will be disqualified.

The master assures the logicians that the puzzle will not be impossible for anyone of them. How will the logicians manage ?

In a jungle where there are no street lights or any other artificial source of lights, I notice a black snake crossing the road.
How did I get sight of the snake?

Find the next number in the series.
1 10 24 43 67 ?

How is the moon similar to a dollar?

Solve the puzzle by telling what does below picture means.