What does an Island and the letter T have in common?

What four weights can be used to balance from 1 to 30 pounds?

I went to the bookshop and spent one-half of the money that was in my purse.

When I came out, I found that I had as many cents as I had dollars and half as many dollars as I had cents when I went in. Find the money in my purse when I entered the store.

I am an odd number. Take away a letter and I become even. What number am I?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Here is what you have to do. You have to throw a ball as hard as you can but it must return back to you even if it does not bounce at anything. Also, you have nothing attached to the ball. There is no one on the other end to catch that ball and throw it back at you.

How will you do it?

With pointed fangs I sit and wait; with piercing force I crunch out fate; grabbing victims, proclaiming might; physically joining with a single bite. What am I?

A father's child, a mother's child, yet no one's son.

Who am I?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?