Riddles of :I am easy to lift but hard to throw what am I

First he takes the goat over and then he goes back to get the cabbage but when he gets the cabbage over he must take the goat back and bring the wolf to where the cabbage is and finally go and bring the goat over and sets on his way.

A poor farmer went to a market to sell some pea and lentil, however as he had only one sack and didn't want to mix peas and lentils, he poured in the sack the peas at first, bound the sack up and than poured in the lentils. At the market a rich innkeeper wanted to buy the peas, but he did not want the lentils.
How would you solve this problem if you had only the sack of innkeeper, which he wants to keep (without devaluing the goods).

Answer

Pour the lentils into the innkeeper’s sack, bind it and turn inside out. Pour in the peas.
Then unbind the sack a pour the lentils back to your sack.

Jack is a farmer and owns some chickens. One day, he took a basket of fresh eggs to the market to sell. The first person bought half of all the eggs in the basket and half an egg. Then, the second person bought half of the remaining eggs and half an egg. Later, the third person bought half of the remaining eggs and half an egg. Now Jack's basket has only 1 egg left. If no eggs were broken in the process, how many eggs did he originally have in his basket?

Answer

The answer is 15. The first person bought half of the 15 eggs which is 7½ eggs and another ½ egg. So he bought 8 eggs in total and Jack is left with 7 eggs. The second person bought half of the remaining 7 eggs which is 3½ eggs and another ½ egg. So he bought 4 eggs and Jack is left with 3 eggs. The last person bought half of the remaining 3 eggs which is 1½ eggs and another ½ egg. So the last person bought 2 eggs. That leaves 1 egg remaining in Jack's basket.

There are 7 pairs of shoes. Someone takes one of the shoes. How many shoes are left?

Answer

13
because 7+7=14 and 14-1=13

What is as big as you are and yet does not weigh anything?

Answer

Your shadow.

Of all the numbers whose literal representations in capital letters consists only of straight-line segments (for example, FIVE), only one number has a value equal to the number of segments used to write it.
Which number has this property?

Answer

This is the only solution that satisfies the requirement that the capital letters shall consist only of straight-line segments:
TWENTY-NINE