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Sir/Mam

I tried my level best to find answer to this puzzle and posted my queries to many websites and failed in all. Since this is my last chance to get the answer pls reply to this question.

A knife, a soap and a banana are given and the question is to cut the banana after cutting the soap using the same knife provided the taste of soap should not be there with the banana.

The hint given with question was try with the basis of chemistry thats why after my failure I contact you IITians believing you people will help to find a solution for this.Please.


Alexander , 16 Years ago
Grade 6
anser 1 Answers
Askiitians Tutor Team

It's great that you're seeking help with this puzzle! The challenge involves cutting a banana after cutting a soap, using the same knife, while ensuring that the taste of the soap does not transfer to the banana. This is indeed a chemistry-related problem, and I can help you understand how to approach it.

Understanding the Problem

The key here is to consider the properties of the materials involved—specifically, the soap and the banana. Soap is made up of surfactants, which can leave a residue that might affect the taste of the banana. To solve this puzzle, we need to think about how to minimize or eliminate that residue.

Step-by-Step Solution

  • Cut the Soap First: Start by cutting the soap with the knife. This is the first step, as the soap is the item that could leave a residue.
  • Rinse the Knife: After cutting the soap, it’s crucial to rinse the knife thoroughly with water. This step is essential because it helps remove any soap residue that might cling to the blade.
  • Dry the Knife: Use a clean cloth or paper towel to dry the knife completely. This prevents any leftover water (which may contain soap particles) from affecting the banana.
  • Cut the Banana: Now, with a clean and dry knife, you can cut the banana. Since the knife has been rinsed and dried, there should be no soap taste transferred to the banana.

Why This Works

The reason this method is effective lies in the chemistry of soap and water. Soap molecules are amphiphilic, meaning they have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts. When you rinse the knife, the water helps to wash away the soap molecules. By drying the knife, you ensure that no water (and thus no soap residue) remains when you cut the banana.

Real-World Analogy

Think of it like washing your hands after handling something sticky or greasy. If you just wipe your hands with a towel without washing them, the residue will still be there. But if you wash them with soap and water, and then dry them, they will be clean and ready to handle food without transferring any unwanted flavors.

Final Thoughts

By following these steps, you can successfully cut the banana without any soap taste. This puzzle not only tests your problem-solving skills but also your understanding of basic chemistry principles. If you have any more questions or need further clarification, feel free to ask!

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