What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

Anabelle is a clever trader of rare artefacts. Each day she carries three boxes each filled with thirty artifacts. The boxes can't hold more than that. She travels far in northern lands to sell these artefacts but on the way, she comes across thirty checkpoints where she has to shed one of the artefacts for each sack to the authorities for letting her pass.

How many artifacts will be left with her when she reaches her destination crossing all the checkpoints?

In a contest, four fruits (an apple, a banana, an orange, and a pear) have been placed in four closed boxes (one fruit per box). People may guess which fruit is in which box. 123 people participate in the contest. When the boxes are opened, it turns out that 43 people have guessed none of the fruits correctly, 39 people have guessed one fruit correctly, and 31 people have guessed two fruits correctly.
How many people have guessed three fruits correctly, and how many people have guessed four fruits correctly

Can you name an animal whose killing cannot be performed without spilling your own blood?

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

Why do people go to bed?

How many minutes are there in Feb 2017?

Note: The shortest answer is the correct answer.

John has played 50 ODI's and his average is 50. How many runs should he score in his 51st ODI, so that his average score jumps to 51?