The centre of the third figure is empty. What digit should fit inside?

What kind of band never plays music?

Take one out and scratch my head, I am now black but once was red. What am I?

In a competitive exam, each correct answer could win you 10 points and each wrong answer could lose you 5 points. You sat in the exam and answered all the 20 questions, which were given in the exam.
When you checked the result, you scored 125 marks on the test.

Can you calculate how many answers given by you were wrong?

Why do people go to bed?

With the help clues provided in the image, can you find the 5 digit key?

Imagine a box with two cogwheels, one big with 24 teeth and one small with 8 teeth. The big one is firmly attached to the center of the box which means it does not turn or move while the small one rotates around the big one.

How many times do you think that the smaller wheel will turn compared to the box when it turns once around the big one?

I have no life, but I can die. What am I?

Can you decipher the following common phrase?

T M C
A U O
H S M
W T E

I am Huge on Sunday and Saturday.
I am small from Tuesday to Thursday.
I do not exist on Monday and Friday.
Who am I?