When monkey rotate the gear, which mark will be hit 1 or 2 ?

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

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

What is the next shape from answers A, B, C, and D figure?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

Why is the Hole below a Lock?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

You are a prisoner sentenced to death. The Emperor offers you a chance to live by playing a simple game. He gives you 50 black marbles, 50 white marbles, and 2 empty bowls. He then says, 'Divide these 100 marbles into these 2 bowls. You can divide them any way you like as long as you use all the marbles. Then I will blindfold you and mix the bowls around. You then can choose one bowl and remove ONE marble. If the marble is WHITE you will live, but if the marble is BLACK... you will die.'

How do you divide the marbles up so that you have the greatest probability of choosing a WHITE marble?

Distances from you to certain cities are written below.

BERLIN 200 miles

PARIS 300 miles

ROME 400 milesAMSTERDAM 300 miles

CARDIFF ??? miles

How far should it be to Cardiff ?