What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

Assume the given figure to be a delicious doughnut. Yes, now you can concentrate more on the puzzle. So you have this delicious doughnut in your refrigerator when your friends come knocking at the door. There are eight of them. Now you have to make three cuts in this doughnut so that each one of you nine people can enjoy a piece of it. Neither you nor your friends would mind the size of their piece as long as they are getting it. How will you do it?

I am not a bull but I have horns.
I am not an ass but I have a pack saddle.
Wherever I go, I leave silver behind me.

Who am I?

There once were seven dwarfs who were all brothers. They were all born two years apart. The youngest dwarf is seven years old. How old is his oldest brother?

What is the fastest way to double your money?

What is the last thing you take off before bed?

4 fathers, 2 grand-fathers and 4 sons went to watch the movie.What is the minimum number of tickets they need to buy ?

If Rajina's daughter is my daughter's mom, who am I to Rajina?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

I have Rs.50 and I spend it in the way as below.