If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

Why is it very easy to weigh a fish?

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?

What 5-letter word typed in all capital letters can be read the same upside down?

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

If two's company, and three's a crowd, then whats four and five ?

Name the three-letter word that can complete the below words?

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E

A Man gave one of his sons 10 cents and another son was given 15 cents. What time is it?
Hint: Figure out the relation between time and number, is not so easy..:)

Wednesday, Steve and Pam go to a restaurant to eat lunch. After eating lunch, they pay the bill. But Steve and Pam do not pay the bill. So…who does?