If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

What does this rebus mean?

O
N
C
E
TIME

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

Let's play a word game. Following are some meaningless words that can be completed by adding random letters on either side of the word.

For example, the word "rdo" can be formed into "pardon".

Using the same technique, can you complete the given words?
ecalc
airb
rinci
tibac
uidel
gorit
igna
eyho

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

One absent-minded ancient philosopher forgot to wind up his only clock in the house. He had no radio, TV, telephone, internet, or any other means for telling time. So he travelled on foot to his friend's place a few miles down the straight desert road. He stayed at his friend's house for the night and when he came back home, he knew how to set his clock. How did he know?

A thief enters a store and threatens the clerk, forcing her to open the safe. The clerk says, “The code for the safe is different every day, and if you hurt me you’ll never get the code.” But the thief manages to guess the code on his own. How did he do it?

You are given with the following sum. Each of the letters can be decoded as a digit. If we tell you that D = 5, then can you solve it entirely?

DONALD
+GERALD
=ROBERT

How many minutes are there in Feb 2017?

Note: The shortest answer is the correct answer.

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?