A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

Which is the rope you never skip with?

Replace the question mark with the correct number in below Picture:

What does this mean?
N
A
E
L
C

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

Can you decipher these quotes by Albert Einstein?
Blf xzm mvevi hloev z kilyovn lm gsv ovevo lm dsrxs rg dzh xivzgvw.

A river should be crossed by a father, a mother and their two sons and two daughters.
There are some rules that should be followed while crossing the river. There can be only two people in the raft while crossing. The daughters cannot be with their father unless there is the presence of the mother. The sons cannot be with their mothers unless the father is present. Unless the guard is on the board, the criminals cannot be with any of the family members. Only the adults like the father, the guard, and the mother knows to use the raft.

How will they cross the river?