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

You walk into a creepy house by yourself. There is no electricity, plumbing, or ventilation. Inside you notice 3 doors with numbers on them. Once you open the doors you will die a particular way. Door No.1 You’ll be eaten by a lion who is hungry. Door No.2 You’ll be stabbed to death. Door No.3 There is an electric chair waiting for you. Which door do you pick?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

Which digit occurred maximum times between the number 1 and 1000?

A large container is kept in open under the rain. Every passing hour, the water collected inside the container becomes double what it was.

In ten hours, the container is filled completely. Can you calculate how long would it have taken to be filled in half?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

What month of the year has 28 days?

I am 5 letters long.
My first two tell you who I am
My first 3 could be a medicine
My last three reversed could be a young boy.
My 4th, 3rd and 2nd in that order could be a fruit drink.
If you have me you may hang me round your neck
WHAT AM I ?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?