What has many keys but can’t open a single lock?

Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

Which alphabet letter is a question?

A man was found murdered on Sunday morning. His wife immediately called the police. The police questioned the wife and staff and got these alibis: The Wife said she was sleeping. The Cook was cooking breakfast. The Gardener was picking vegetables. The Maid was getting the mail. The Butler was cleaning the closet. The police instantly arrested the murderer. Who did it and how did they know?

There are 3 apples in the basket and you take away 2. How many apples do you have now?

If eleven plus two equals one, what does nine plus five equal?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?

If,

20 % 5 = 24

21 % 7 = 33

42 % 6 = 67

Then;

66 % 6 = ?

You bought me for dinner but never eat me. What am I?

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?