You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

When I asked a girl's name she told me her name is the date '07/09/2001'.

I thought for a few seconds and then I got her name. Do you?

I have branches, but no fruit, trunk or leaves. What am I?

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?

If 1+9+8=1, what is 2+8+9?

If 21x = 79x, what is the value of x?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

John gave half of the apples he had plus one more to Jacob. He gave half of the remaining ones plus one more to James. Now, John was left with just one apple.

Can you find out how many did he have in the beginning?

I am sure no one can have two things for dinner. what are they?

Can you find out which triangle will have a bigger area among the following?
1. A triangle with sides 300, 400 and 500
2. A triangle with sides 300, 400 and 700