Solution:

Its explained in the picture and video

Solution:

O + Pi + nion (Pi In Onion)
= Opinion

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:

The third Man as there is no shadow of the man.

Solution:

Number 66

Solution:

Line - C

Explanation:
A^2= 3^2 + 6^2 => 9+36 => 45
B^2= 5^2 + 5^2 => 25+25 => 50
C^2= 6^2 + 4^2 => 36+16 => 52
D^2= 7^2 + 1^2 => 49+ 1 => 50

Solution:

All are at an equal distance from the ceiling.

Solution:

A

The ladder of B is about to break.

Solution:

25

Solution:

String 2.