Why is it very easy to weigh a fish?

I have holes on the top and bottom. I have holes on my left and on my right. And I have holes in the middle, yet I still hold water. What am I?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

What does this rebus means ?

PROG WORKRESS

John was visiting his friend Jacob. He found out that his friend's wife had just killed a burglar in self-defense.
John asks Jacob about what happened and he told that "His wife was watching television when suddenly the bell rang. She thought that it is her husband Jacob but she found the burglar who attacked her instantly and she got so frightened that she killed the burglar immediately with the knife.
John asked the police to arrest his friend's wife. Why?

John is a strange liar.

He lies on six days of the week, but on the seventh day, he always tells the truth.

He made the following statements on three successive days:

Day 1: "I lie on Monday and Tuesday."
Day 2: "Today, it"s Thursday, Saturday, or Sunday."
Day 3: "I lie on Wednesday and Friday."

On which day does John tell the truth?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

If it took eight men ten hours to build a wall, how long would it take four men to build it?

I have eight fingers and two thumbs but I do not live. What Am I?

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?