Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

Find out a multi-digit number that if multiplied by the number 9 or any of its multiplications products (i.e. 18, 27, 36, 45,..) will result in the multiplication factor repeated (n) number of times.

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

What goes through cities and fields, but never moves?

Place a mathematical symbol between the numerals 5 and 9 in such a way that the resulting number is greater than 5 but smaller than 9.

In a contest, four fruits (an apple, a banana, an orange, and a pear) have been placed in four closed boxes (one fruit per box). People may guess which fruit is in which box. 123 people participate in the contest. When the boxes are opened, it turns out that 43 people have guessed none of the fruits correctly, 39 people have guessed one fruit correctly, and 31 people have guessed two fruits correctly.
How many people have guessed three fruits correctly, and how many people have guessed four fruits correctly

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

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

Let's play a word game. Following are some meaningless words that can be completed by adding random letters on either side of the word.

For example, the word "rdo" can be formed into "pardon".

Using the same technique, can you complete the given words?
ecalc
airb
rinci
tibac
uidel
gorit
igna
eyho