Using Only Five 5's and any mathematical operator make sum as 37

Rectify the following equality 101 - 102 = 1 by moving just one digit.

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

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?

I ask Joseph to pick any 5 cards out of a deck with no Jokers.

He can inspect then shuffle the deck before picking any five cards. He picks out 5 cards then hands them to me (Jack can't see any of this). I look at the cards and I pick 1 card out and give it back to Joseph. I then arrange the other four cards in a special way, and give those 4 cards all face down, and in a neat pile, to Jack.

Jack looks at the 4 cards i gave him, and says out loud which card Joseph is holding (suit and number). How?

The solution uses pure logic, not sleight of hand. All Jack needs to know is the order of the cards and what is on their face, nothing more.

In a rainy season, one day 3 huge ladies walked under a normal-sized umbrella.
The umbrella is not huge enough to accommodate all 3 ladies yet not a single lady got wet. Why?

What number should come in place of the question mark below?

Why are all black people so quick ?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

What has 88 keys?