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?

Find the next number in the sequence

5 12 24 36 ?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

Find the mistake in the below maths equations

A = 2
A(A-1) = 2(A-1)
A2-A = 2A-2
A2-2A = A-2
A(A-2) = A-2
A = 1

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

Why is the Hole below a Lock?

Below is the sum of symbols in each row and column in the figure. Analyzing the figure, can you find out the value of the symbols?

A B C D E F G H

These are the letters given to you. Now you have to find out the letter that comes two to the right of the letter which is immediately to the left of the letter that comes three to the right of the letter that comes midway between the letter two to the left of the letter C and the letter immediately to the right of the letter F.

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.