Solution:

43

Solution:

46

Solution:

905

Solution:

25

Solution:

100.

For a detailed explanation, please watch the video.

Solution:

4.

The number in every row indicates the number of crossed lines in every shape

Solution:

The triangle value is 1.

Solution:

You need to write numbers as Roman Numerals.

29 = XXIX
1 = I
29 - 1 = XXIX - I = XXX
XXX = 30

Solution:

39.

Solution:

405

For an explanation, watch the video.