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

Can you make the below equation true by using any three numbers from "1, 3, 5, 7, 9, 11, 13 and 15"?

( ) + ( ) + ( ) = 30

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

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

In the given picture, in how many ways can you read the word "Tiger"?

Can you write down eight eights so that they add up to one thousand?

A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters. How many brothers and sisters are there in the family?

In the image below, you can see two glasses and two matchsticks.You need to move four matchsticks in such a manner that the crosses come inside the glasses. Note: you cannot move the crossed.

Use the numbers 2, 3, 4 and 5 and the symbols + and = to make a true equation. Conditions: Each must be used exactly once and no other numbers or symbols can be used.