Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

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 ?

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

The centre of the third figure is empty. What digit should fit inside?

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 the missing number in the sequence below:

The host of a game show, offers the guest a choice of three doors. Behind one is a expensive car, but behind the other two are goats.
After you have chosen one door, he reveals one of the other two doors behind which is a goat (he wouldn't reveal a car).

Now he gives you the chance to switch to the other unrevealed door or stay at your initial choice. You will then get what is behind that door.

You cannot hear the goats from behind the doors, or in any way know which door has the prize.

Should you stay, or switch, or doesn't it matter?

Find out the number of circles in the given picture having Illusion

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?