Solution:

1 7
X 4
---
68
25
---
93

For an explanation, you can watch the video.

Solution:

It can be done as shown in the video below.

Solution:

75.

For a detailed explanation, please watch the video.

Solution:

16

Watch Video for more explanation.

Solution:

30.

For Explanation, watch video

Solution:

49.

Please watch the video for an explanation.

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:

Add two squares as shown in the picture below.

Solution:

This is a Perception riddle and hence there is no right or wrong attached to this answer.

It can be considered as a sound
> It makes the sounds of branches snapping and the almighty thump when the trunk hits the hard ground. The sound is sound and doesn't rely on people to interpret it.
> Yes. And isn't that a rather arrogant question, as what about all the animals that presumably hear it?

It cannot be considered as a sound because
> Does it depend on what you mean by 'sound'? The airwaves would still vibrate but without an ear/listening device to receive them, there would be no sound.
> The sound is something within human experience. Outside of this, it's just air (or whatever another medium) vibrating. If someone is there to hear it, it makes a sound, if not, it causes rapid movement of particles.

Solution:

A - Gold
D - Silver
C - Bronze