I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

Find out the missing number in the picture attached:

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

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

What's the only room from which no one can enter or leave

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?

Can it be possible to build a house that has all its four walls facing towards the South?

Can you quickly find which two matchstick figures are identical?

John: "Hi Teacher, What is your favourite movie ?".
Chemistry Teacher: "Indium Cerium Platinum Iodine Oxygen Nitrogen".
Ten seconds later... John replied I got it.

Do you?