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

Sally lives in a place where six months of the year is mild summer and the temperature drops significantly the other six months. She owns a lake where there is a small island. She wants to build a house on the island and needs to get materials there. She doesn’t have a boat, plane, or anything to transport them to the island. How does Sally solve this problem?

Why is it very easy to weigh a fish?

What brings you down but never up?

No matter how little or how much you use me, you change me every month. What am I?

Why do Chinese men eat more rice than Japanese men do ?

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?

Consider all the numbers between 1 and 1 million. Among all these numbers, there is something very special about the number 8 and the number 2202. What is it?

Which five letter word can be added at the end of below word to form a
valid word?

> Pin
> Check
> Boiling
> View

What can go up a chimney down, but can’t go down a chimney up?