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

In the city of Brain Teasers, 5% of people do not list their phone numbers. Now if we select random 100 people from the phone directory, then how many people selected will have unlisted phone numbers?

Buy me, smell me or deliver me, I do not change.

Who am I?

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

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

There is a box in which distinct numbered balls have been kept. You have to pick two balls randomly from the lot.

If someone is offering you a 2 to 1 odds that the numbers will be relatively prime, for example
If the balls you picked had the numbers 6 and 13, you lose $1.
If the balls you picked had the numbers 5 and 25, you win $2.

Will you accept that bet?

In two decks of cards, what is the least amount of cards you must take to be *guaranteed* at least one four-of-a-kind?

No one wants to have it, but if one got it, he does not want to lose it. What is It?

What does this below rebus puzzle mean?

What number should come in place of the question mark below?