Identify the hidden meaning behind this picture?

If,

20 % 5 = 24

21 % 7 = 33

42 % 6 = 67

Then;

66 % 6 = ?

Something Extraordinary happened on May 6th 19778 at 12:34am what was that?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

Find the Odd One Out?
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Can you solve this picture maths equation?

In the picture that is attached with this question, you can find a square which comprises of four little squares inside it. Consider this square to be made with matchsticks. You have to remove two matchsticks such that only two squares remain instead of five.How will you do it ?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

Can you solve the photo plexer logic ?

Different lights make me strange by changing me into different sizes. What am I?