Which word does the below Plexor means ?

All of Jacob's shoes are red except two.
All of Jacob's shoes are green except two.
All of Jacob's shoes are yellow except two.

How many shoes does Jacob have?

Find out the missing number in the picture attached:

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

Remove two matchsticks to make the below equation correct.

Arrange the numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 above and below the division line in a manner that the thus formed fractions equal to 1/3.

(You can use one number only once)

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

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?

I have teeth but i don't bite. Who Am I ?

Replace the question mark with the correct number in below Picture: