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

John, Jack and Jill are in a desert. John doesn't like Jill and hence decides to murder him. He poisons the water supply of Jill. Since it is a desert area, Jill must drink or he will die of thirst.

Jack does not know of the actions of John and also decides to murder Jill. To succeed in his ill motives, he removes the water supply of Jill so he dies of thirst.

Jill dies due to thirst. Who murdered Jill?

What are the next two letters in the following series and why?
W A T N T L I T F S _ _

*Hint: Check Puzzle Title

1. What does:
TIM JOB
represent?

2. What does:
MO_ _
represent?

The below mentioned letters have been placed in a order using a logic.

DEAD, BALL, FEAR, SHOP

Can you find the logic?

Can you write down eight eights so that they add up to one thousand?

If EELS + MARK + BEST + WARY = EASY

What does HELP + BARK + WARD + LEAD equal?

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

A father's child, a mother's child, yet no one's son.

Who am I?

what does the below math rebus puzzle mean?