If you say my name, I will no longer exist. What am I?

I have branches, but no fruit, trunk or leaves. What am I?

You are offered an opportunity to win a fortune. There are 100 precious black stones and 100 unworthy white stones. There are two different sacks labelled as "Heads" and "Tails". You can distribute the stones as you wish. Then a coin will be flipped. Then you will have to choose a stone from the corresponding sack. If you pick up a black stone, all the fortune of black stones is yours but if you pick up white, you get nothing.

How will you distribute the stones so that you can maximize your chances of winning?

Christina makes tasty toast in a small pan. After toasting one side of a slice, she turns it over. Each side takes 30 seconds. The pan can only hold two slices.
How can she toast both sides of three slices in 1 & 1/2 instead of 2 minutes?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

A maths symbol is hidden in the below Bar Graph. Can you decipher it?

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

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

A shopkeeper allows people to buy a cold drink bottle in exchange for five empty bottles. A guy had a party at home and spent 77 cold drink bottles at the party. Now he has 77 empty bottles with him.

How many bottles do you think he can buy in exchange for those 77 empty bottles?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?