What is in seasons, seconds, centuries and minutes but not in decades, years or days?

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's a single-digit number with no value?

On rolling two dices (six-sided normal dice) together, what is the probability that the first one comes up with a 2 and the second one comes up with a 5?

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

If,

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

Then

4 / 5 = ?

Can you place six X (crosses) in below board without making three in a row in any way ?

O_er_t_o_

Complete the missing letters of the given word.

Mr Red Lives in the red house.
Mr Green Lives in the greenhouse.
Mr Yellow Lives in the yellow house.

Who lives in the Whitehouse?

What kind of tree can you carry in your hand?