What number do you get when you multiply all of the numbers on a telephone's number pad?

Can you tell a 3D object that has just two surfaces?

Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?

What Time Should the last watch show in the below figure?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

The following sentence is false. The preceding sentence is true.
Are these two sentences true or false?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

Find the next number in the sequence

5 12 24 36 ?

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

John was running from 40 thieves. John has got 3 gold boxes which weigh as 4kg, 2kg, and 1kg respectively. A witty man asked John to stay with him for seven days in exchange for 1kg gold per day. John needs to stay there for seven days and also do not want to give the witty man any advance. How can John pay for his seven days stay?