If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

A boy was at a carnival and went to a booth where a man said to the boy, "If I write your exact weight on this piece of paper then you have to give me $50, but if I cannot, I will pay you $50." The boy looked around and saw no scale so he agrees, thinking no matter what the carny writes he'll just say he weighs more or less. In the end the boy ended up paying the man $50. How did the man win the bet?

What have one eye but still cannot see?

A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

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

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

what one word does the below rebus identifies?

Only one colour, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?