By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

If 21x = 79x, what is the value of x?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

What is the last thing you take off before bed?

A solo dice game is played. In this game, upon each turn, a normal pair of dice is rolled and the score is calculated not by adding the numbers but multiplying them.

In a particular game, the score for the second roll is five more than what was achieved in the first roll. The score for the third roll is six less than what was completed in the second roll. The score for the fourth roll is eleven more than what was achieved in the third. The score for the fifth roll is eight less than what was completed in the fourth.

Can you calculate the score for each of the five throws?

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

Use the numbers 2, 3, 4 and 5 and the symbols + and = to make a true equation. Conditions: Each must be used exactly once and no other numbers or symbols can be used.

Make a sentence consisting of three words that have the whole alphabet.