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

Find out the missing number in the picture attached:

We know that the number 7 is the prime followed by a cube. Which next number is also a prime followed by a cube?

What is the end of everything?

What Adam and Eve do not have but the rest of the people have?

1 dollar = 100 cent
= 10 cent x 10 cent
= 1/10 dollar x 1/10 dollar
= 1/100 dollar
= 1 cent

=> 1 dollar = 1 cent

solve this tricky problem?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

There is a wide field of corn. A goose finds its way into the field and starts running. Can you find out till which point the goose can run into the field?

In the addition below, all digits have been replaced by letters. Equal letters represent equal digits and different letters represent different digits.
ABCABA
BBDCAA
ABEABB
ABDBAA
------- +
AAFGBDH
What does the complete addition look like in digits?

Can you find the missing piece of the Porsche?