Why do Chinese men eat more rice than Japanese men do ?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

There are 3 apples in the basket and you take away 2. How many apples do you have now?

What does a man do only once in his lifetime, but women do once a year after they are 29?

Solve The below Equation:

ALFA + BETA + GAMA = DELTA

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

A Japanese ship is sailing in the Indian Ocean. The captain of the ship feels tired and decides to take shower to be rejuvenated. He goes to take the shower after keeping his diamond-studded Rolex watch and gold chain on the table.
When he comes back after 15 minutes, he finds them missing. There are 4 crew members on the ship and he calls them one by one to ask them what they were doing in that duration.

Following are the answers:
1. Crew 'A' who is the cook replies that he was cooking mutton for the crew members.
2. Crew 'B' who is a housekeeper tells that he was sleeping in his room.
3. Crew 'C' who is the engineer says that he was checking on the generator.
4. Crew 'D' who is another housekeeper says that he was correcting the hoisted flag that was put upside down.

It took only a couple of seconds for the captain to find the thief. Can you find the thief too?

1. What does:
TIM JOB
represent?

2. What does:
MO_ _
represent?

Make a sentence consisting of three words that have the whole alphabet.

The host of a game show offers the guest a choice of three doors. Behind one is an expensive car, but behind the other two are goats.
After you have chosen one door, he reveals one of the other two doors behind which is a goat (he wouldn't reveal a car).

Now he gives you the chance to switch to the other unrevealed door or stay at your initial choice. You will then get what is behind that door.

You cannot hear the goats from behind the doors, or in any way know which door has the prize.

Should you stay, or switch, or doesn't it matter?