Find the missing number in the sequence below:

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

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

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

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?

What Deficiency does the below rebus represent?

VIT_MIN

Can you start the fire using two pieces of wood?

Akbar called Birbal and asked him to draw a line on the floor. He asked Birbal to make that line smaller without erasing it. Birbal smiled and did it before Akbar could blink his eyes.

How did he managed to do it?