Solution:

Its explained in the picture and video

Solution:

All men lose the upper body and getting less for exchange. In this way, the losses of parts, account for one vanished one.

Watch the video for more detail.

Solution:

1. The word "are" is repeated twice.
2. The word "to" is repeated twice.
3. The word mitstakes is misspelled. Its should be mistakes
4. The sentence is missing a punctuation mark and should end with a period/full stop not with semicolon.
5. Since there are only 4 mistakes, therefore, the statement of having five mistakes in the sentence is wrong which is the 5th mistake.

Solution:

123 - 45 - 67 + 89

Solution:

He was a twin brother of one of Joseph's friends.

Solution:

66

Solution:

It can be done as shown in the video below.

Solution:

All

Explanation:
By watching the video you will observe that
Person D: The first person will be going to die as the object passes through him.
Person C: Dies due to spikes
Person B: Upon falling, over the see-saw, the blue object lifts up and then kill the person at B
Person A&E: Dies at the end due to coronavirus epidemic spread across the world.

Solution:

3rd.

Explanation:
Rule: Take the bottom row, flip it, and put it on the top.

Solution:

One of 57620 or 57628 must be the secret code.

Explanation:
Hint-1: 79314
Only 7 is there and in wrong

Hint-2: 95643
6 is in the right position while 5 is not

Hint-3: 57319
5 and 7 are in the right position

Sum Hint: A + B + C + D + E = D*10 + E
CaseA - 57620
5 + 7 + 6 + 2 + 0 = 2 * 10 + 0
20 = 20

CaseB - 57628
5 + 7 + 6 + 2 + 8 = 2 * 10 + 8
28 = 28