Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

What always comes into a house through the keyhole?

I am a mother. However, I never give birth.

I am a father. However, I never nurse my children.

Wandering is not possible for me, but standing still happens occurs rarely.

Who am I?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

What can you catch but never throw?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

John and his wife were living in a rural place. On a particular day, John's wife fell ill and he called the local doctor. When the doctor picked up, he said, "Doctor, my wife is ill. She might have appendicitis."

"This can't be possible! I took out her appendix two years ago myself," the doctor explained.

When diagnosed, John's wife was found to have appendicitis. How can this be possible?

A man was driving a black truck. His lights were not on. The moon was not out. A lady was crossing the street. How did the man see her?