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

Joseph buys three kinds of chocolates for 100 rupees. The first one is priced at 5 rupees, second one at 3 rupees and third one at 0.5 rupees.

If he bought 100 chocolates in total, how many pieces do you think he bought each chocolate?

Check out the number list below and find what number comes next in the sequence.

111 , 113 , 117 , 119 , 123 , 137 , ?

What 5-letter word typed in all capital letters can be read the same upside down?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

Find the value of "a" by solving the maths equation in the picture below:

You Are Highly Attentive If You Can Spot A Hat In This Bathroom In 9 Seconds!

Find the number of squares in the below picture

There is a box. The area of its top is 240 square units, the area of the front is 300 square units and the area of the end is 180 square units.

Can you calculate the dimensions of this box with the given data?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?