Identify the hidden meaning behind this picture?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

As shown in the image, the nine Dogs are square fenced. By constructing just two square fences can you make sure that two Dogs cannot meet each other without crossing the fence?

What does below chemistry rebus means?

You are an expert on paranormal activity and have been hired to locate a spirit haunting an old resort hotel. Strong signs indicate that the spirit lies behind one of four doors. The inscriptions on each door read as follows:

Door A: It's behind B or C
Door B: Its behind A or D
Door C: It's in here
Door D: It's not in here

Your psychic powers have told you three of the inscriptions are false, and one is true. Behind which door will you find the spirit?

Count the number of squares in the picture below.

You have an empty wine bottle with a cork that has been secured at the top in a normal way. There is a metal ring inside the bottle that is suspended by a string.

How can you make the metal ring drop to the bottom if you are not allowed to touch anything - not the bottle, not the cork, not the thread and not the ring?

Replace the question mark with the correct number.

No matter how little or how much you use me, you change me every month. What am I?

Can you complete the sequence puzzle?

AR TA GE CA LE VI LI _