Two boys were admitted to a school. When the headmaster asks them about their parents, they tell him that they have same parents (father and mother). On further inquiry, it turns out that they both share the same date for their birthday.

"Are you twins," ask the headmaster.
"No," replies the boys.

Is it possible?

It is raining today at 11:59 am. What is the probability of sunny weather after 72 hours?

Three ants are going up a hill, one behind the other. The last ant then says to the other ants, 'There is an ant behind me!'' How come?

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?

He runs but never walks. Murmurs, but never talks. Has a bed, but never sleeps. And has a mouth, but never eats?

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

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

What number should come in place of the question mark below?

There is a place where if I stand up straight, I will still be considered sideways.

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