What is so fragile that saying its name breaks it?

What is the fastest way to double your money?

Count the number of triangles in the picture below:

How can you write nineteen in a manner that if we take out one, it becomes twenty?

What is greater than gold but cannot be bought. it can never be sold and can earn if its sought. though it can be broken, it can still be fixed. for by birth it can't start nor by death it is ended.what am i?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

Without looking at a calendar, within a minute name, a boy's name using 5 consecutive 1st letters of 5 consecutive months

During which month do people sleep the least?

If six children and two dogs were under an umbrella, how come none of them got wet?

There is a jar in which there are two types of candies.
20 blueberries and 16 strawberries. You perform the following steps:
1) You take out two candies.
2) If the two candies are of the same flavour, you add a blueberry one otherwise, you add the strawberry one.

You repeat these two steps till there is just one candy remaining in the jar. Which flavoured candy will be left?