Logic riddles

Guys that laugh and don’t make you frown make you smile and never let you far.
Who is it?

Answer

A clown.

Two people were in a marathon, and they both won the marathon. The weird thing is that they weren't tied.
How can that be possible?

Answer

They were siamese twins, so that means they won the marathon at the same time.

Cain comes into his doctor's office, highly intoxicated. He tells his doctor, "I'm seeing doubles of everybody, doc. Including you." The doctor said,"Cain. You've been drinking. I can smell it on your breath. Listen. The alcohol will eventually wear off. Its all in your head." The doctor escorted Cain in front of two mirrors facing the wall in his office and said,"Relax and take a deep breath. Now, how many do you see?"
What did Cain see?

Answer

4 mirrors facing the wall.

Add me to myself, multiply me by 4, divide me by 8, and you'll have me once more.
What am I?

Answer

Any number.

I am a seven letter word, you read me daily. Letters 567 increase every year. The third and fourth letters are the same and my 325 letters cover about 70% of the world. What am I?

Answer

MESSAGE.
Letters 5, 6 and 7 increase every year. This is AGE. Letters 325 cover 79% of the world. This is SEA. Letters 3 and 4 are the same, since the 3rd letter on the second clue is SS, let us assume that 3 and 4 are letters S.

Martin is a butcher. Her feet are size 8, and she is 5 foot 11.
What does she weigh?

Answer

Meat. She is a butcher.

A large truck is crossing a bridge 1 mile long. The bridge can only hold 14000 lbs, which is the exact weight of the truck. The truck makes it half way across the bridge and stops. A bird lands on the truck. Does the bridge collapse? Give a reason.

Answer

No it does not collapse.
Because it has driven a half mile - you would subtract the gas used from the total weight of the truck.

I am a fleeting shadow, elusive and fleeting, some chase after me.
What am I?

Answer

Fame.

Above the kingdom I reign,
Spotted, speckled, with a mane,
I travel in packs,
And if you’re lucky, you’d ride me.
What am I?

Answer

Giraffe.

There is a castle with a square moat. It is 2 meters across. You have 2 planks of 1.5 meters in length. You MUST use the planks to cross the moat, there are crocodiles in the water and you are standing on concrete ground. You are trying to get IN to the castle.
How do you cross the moat?

Answer

Put one plank across a corner, then balance the second one between the first plank and the ground on the other side of the moat.

A man was sitting on his couch and searching for the English Channel.
How did he find it?

Answer

Probably a map, it is between England and France.

It is sharp but not pepper, white but not paper, green but not shaddock.
What am I?

Answer

Radish.