If the word "green" actually means "red", "red" means "yellow", "yellow" means "blue", "blue" means "orange" and "orange" means "green", what will be the colour of a clear sky in this code language?

Introduction / Context:
This is a classic colour renaming puzzle where colour words are reassigned to different meanings. The question checks your ability to distinguish between the real world fact (the actual colour of the sky) and the new artificial naming scheme described in the question.

Given Data / Assumptions:
We are told the following meanings:
"green" means red.
"red" means yellow.
"yellow" means blue.
"blue" means orange.
"orange" means green.
We also know from general knowledge that the colour of a clear sky is blue.

Concept / Approach:
The crucial idea is to first decide the true colour of the object (the sky) in the real world, and only then translate that colour into the new language. We must not start from the given words and move backwards; instead we begin with the fact that a clear sky is blue and then see which word has been defined to mean blue in the puzzle.

Step-by-Step Solution:
Step 1: In reality, the colour of a clear sky is blue. Step 2: According to the code language, the word "yellow" means blue. Step 3: However, the question asks, "what is the colour of clear sky?" in the coded world. That means we must give the name that people in this code language would speak when they look at the sky. Step 4: They will see the real colour blue, but in their language "blue" stands for orange. So the spoken colour word corresponding to the sky will now be "orange".

Verification / Alternative check:
We can follow the mapping carefully: real-blue → code-word "orange" (because "blue" means orange). The intermediate line about "yellow" meaning blue can confuse you if you try to work in the wrong direction, but for naming the visible colour, what matters is which word denotes blue in the coded system, and that chain leads us finally to "orange" as the spoken word.

Why Other Options Are Wrong:
"Blue" is the real colour, not the coded name. "Green" and "Yellow" are both used in the chain but do not represent the spoken name for the sky when the mapping is applied correctly. None of them is the final word that people in this language would use when they observe a blue sky.

Common Pitfalls:
Learners often rush and answer "blue" simply because they recall the real colour of the sky. Others stop the chain at "yellow means blue" and mistakenly answer "yellow". It is important to read the full set of mappings and trace which word will actually be spoken for the real colour in question.

Final Answer:
In this coded language, a clear sky would be described as orange.