using four eights (8) and a one (1) and one mathematical symbol , create the number 100

What is black when you buy it, red when you use it, and gray when you throw it away?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

An inspection by the superintendent of St. Joseph School was scheduled on the next day. The class teacher Jenifer knew that he would be asking questions from her class and she would have to choose a pupil to answer. To offer a perfect impression over him, the teacher explained certain instructions to the students to maximise the chances of getting correct answer every time.

What did she say to the students?

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

What number should come in place of the question mark below?

What is next number in the pattern below:

131 517 192 123 ?

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

Can you name an animal whose killing cannot be performed without spilling your own blood?