Find the mistake in the below maths equations

A = 2
A(A-1) = 2(A-1)
A2-A = 2A-2
A2-2A = A-2
A(A-2) = A-2
A = 1

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

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 make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

If eleven plus two equals one, what does nine plus five equal?

Chhote se Chintu Miyan,
Lambi si Pooch.
Jahan Jaye Chintu Miyan,
Wahan Jaye Pooch.

छोटे से चींटू मियाँ,
लंबी सी पूंछ।
जहाँ जाये चींटू मियाँ,
वहाँ जाये पूंछ।

Bolo kya?

What brings you down but never up?

How many words can a quill made with the feather of a pigeon write with a 100ml bottle of black ink?

I was speeding and ran through a stop sign, yet two traffic officers who were there do nothing about it.

why?