What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

Given below is simple addition with a defined pattern pattern:
7 + 7 = 2
8 + 8 = 4
8 + 5 = 1
6 + 9 = 3
10 + 11 = 9

Can you analyze the pattern and find out the answer for:

4 + 9 = ?

Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?

John is a strange liar.

He lies on six days of the week, but on the seventh day, he always tells the truth.

He made the following statements on three successive days:

Day 1: "I lie on Monday and Tuesday."
Day 2: "Today, it"s Thursday, Saturday, or Sunday."
Day 3: "I lie on Wednesday and Friday."

On which day does John tell the truth?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

What four weights can be used to balance from 1 to 30 pounds?

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?

I always drive my customer away.

Who am I?