What Adam and Eve do not have but the rest of the people have?

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 ?

What always comes into a house through the keyhole?

Astrology starts with the alphabet A, Biology starts with B, Psychology with P and Limnology with L.

Can you find an "ology" that begins with a P?

Why are all black people so quick ?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

What is common among 11, 69, and 88?

You are a cab driver who pools passengers. You pick 3 people from a destination and drop 1 after an hour. 2 people climb aboard at the same time and you drop 3 at the next destination. After some time, you pick 2 passengers only to drop 1 after a short distance where 3 more passengers climb up the cab. You leave the rest of the passengers one by one to their destination and then come back home.

Can you tell the eye color of the cab driver?

You can see three almost identical images below. Can you spot the odd one out from them?

They are three errirs in this question. Can you find them?