What number do you get when you multiply all of the numbers on a telephone's number pad?

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 ?

A thief enters a store and threatens the clerk, forcing her to open the safe. The clerk says, “The code for the safe is different every day, and if you hurt me you’ll never get the code.” But the thief manages to guess the code on his own. How did he do it?

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

You have to put a letter on the following to make it a meaningful word. The only challenge is that you can't use 'E'.

S E Q U E N C _

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

Usually, a boxing match consists of twelve rounds. In a particular friendly match between two heavyweights, the match was finished in the ninth round itself as one of the boxers knocked out the other one.

But, in that fight, no man threw even a single punch.

How can this be possible?

How can you make number one disappear by adding something to it?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?