Can you replace the question mark with the correct number?

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

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

What is next number in the pattern below:

131 517 192 123 ?

A man dies of old age on his 25 birthday. How is this possible?

Can you make four (4) nines (9) equal 100?

Move four matchsticks to the below square to form three squares?

How many times can you subtract the number 5 from 25?

John drives to his office at 20km/hr. After reaching the office, he realizes that today is a holiday. He went back at an average speed of 30km/hr. Discounting the time spent in the stoppage what was the average speed of his journey?