Complete the following series. It.s very logical:

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

Forwards I am heavy, backward I am not. What am I?

A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

A deaf and mute man goes to the train station. Tickets for the train are 50 cents each. The man goes to the ticket booth and hands the man inside just a dollar. The man in the booth hands him two tickets.

How did the man in the booth know to give him two tickets without even looking at him?

There is a hypothetical state between the USA and Mexico border 'Tango'.
Here 70 percent of the population have defective eyesight, 75 percent are hard of hearing, 80 percent have Nose trouble and 85 percent suffer from allergies, what percentage (at a minimum) suffer from all four ailments?

What is the word or phrase?

I am white when I am dirty, and black when I am clean. What am I?

A bomb goes off.
Carnage.
One person, only a few feet away, survives! How can this be?