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

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?

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

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

Name a key which is hardest to turn.

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

I am a word that begins with the letter “i.” If you add the letter “a” to me, I become a new word with a different meaning, but that sounds exactly the same. What word am I?

Replace the question mark with the correct number below.

A mother is 21 years older than her child. In exactly 6 years from now, the mother will be exactly 5 times as old as the child.
Where's the father?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.