John was piloting a plane behind a car but was never able to overtake it. Why?

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

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?

What number divided by 4 is the same as that number minus 4?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

A person is found murdered in his Chamber. When the crime scene is investigated, the Investigator find out that there is a calendar on which the victim has written a few numbers with his blood. The numbers are 4, 11, 11 and 4.

There are four suspects in the murder, John, Jacob, Anna and Lee. Can you find out who is the murderer?

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

Can you count the number of quadrilaterals in the picture below?

Check out the number list below and find what number comes next in the sequence.

111 , 113 , 117 , 119 , 123 , 137 , ?