What is both possible and impossible at the same time?

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?

Suppose we lay down two cups in front of you. One of the cups is filled with tea and the other one with coffee. Now we ask you to take a spoonful of tea and mix it with the coffee. At this moment, the coffee cup has a mixture of tea and coffee. You have to take that mixture (spoonful) and add it back to the tea.

Can you now tell if the cup of coffee has more tea or the cup of tea has more coffee?

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

John leaves home and then he takes three right turns. John wants to return to home but he was scared of Jacob, who is wearing a mask.

What is John Situation ?

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 = ?

He loves to dance, twist and prance, he shakes his tail, and as a way he sails, wingless he flies into the sky. What is he?

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

Which city is three-fifths chick two third cat and 50% goat?

How many letters are in the alphabet?