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

A California farmer owns a beautiful pear tree. He supplies the fruit to a nearby grocery store. The store owner calls the farmer to see how much fruit is available for him to buy. The farmer knows the main trunk has 24 branches. Each branch has exactly 12 boughs and each bough has exactly 6 twigs. Since each twig bears one piece of fruit, how many plums will the farmer be able to deliver?

How many times in a given day, minutes and hour clock comes in a straight line ?

Solve the alphametic puzzle by replacing the alphabet with the number.

S T O R M +
S O L E S
=========
T O W E L
=========

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

Can you find out the missing number in the grid?

What is the word or phrase?

How many triangles can you find in this given picture?

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

If 21x = 79x, what is the value of x?