What is the next number in this series?

4,12,84,3612....

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

What is the below Rebus indicate?

Solve the puzzle by telling what does below picture means.

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

One day Jenifer meets the Lion and the Tiger in the Forest of Forgetfulness. She knows that the Lion lies on Mondays, Tuesdays, and Wednesdays, and tells the truth on the other days of the week. The Tiger, on the other hand, lies on Thursdays, Fridays, and Saturdays, but tells the truth on the other days of the week. Now they make the following statements to Jenifer:

Lion: Yesterday was one of my lying days.

Tiger: Yesterday was one of my lying days too.

What day is it?

2 ladies and 2 girls need to cross a river in a boat big enough for 1 LADY or 2 girls. How do they do it?

Decode the movie name from the below picture?

Three ants are going up a hill, one behind the other. The last ant then says to the other ants, 'There is an ant behind me!'' How come?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?