Can you place three balls such that the equation shown in the picture holds true?

There are three boxes on a table. One of the box contains Gold and the other two are empty. A printed message contains in each box. One of the message is true and the other two are lies.

The first box says "The Gold is not here".

The Second box says "The Gold is not here".

The Third box says "The Gold is in the Second box".

Which box has the Gold?

John and Jacob are twin brothers. One of them is a liar whereas the other one is a truth-teller.

I called their home number and one of them picked up.
I asked. 'Does John lie?' The person replied with a yes.

Whom did I talk with, John or Jacob?

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

John was drowned by he was not wet. How?

What is the next number in the series?

15 29 56 108 208 ?

Count the Triangle in the figure given below:

Astrology starts with the alphabet A, Biology starts with B, Psychology with P and Limnology with L.

Can you find an "ology" that begins with a P?

Can you find the dog hidden in a group of pandas?

I don't get anymore wetter, no matter how much rain falls on me.