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To solve the problem, we need to count the minimum number of sharks based on the given visual impairments.

### Given:
- 3 sharks can't see with the right eye.
- 3 sharks can't see with the left eye.
- 3 sharks can see with the right eye.
- 3 sharks can see with the left eye.
- 3 sharks can see with both eyes.
- 3 sharks are completely blind.

### Minimum Sharks Calculation:
We need to combine these conditions to minimize the total number of sharks:

1. **Sharks with only one good eye:**
   - 3 sharks have only a good right eye.
   - 3 sharks have only a good left eye.

   Since they are distinct in the way they see, that's a minimum of 6 different sharks.

2. **Sharks with both good eyes:**
   - 3 can see with both eyes.

   This does not add to the total because these sharks cover the criteria of being able to see with both right and left eyes.

3. **Completely blind sharks:**
   - 3 completely blind sharks.

### Total:
Adding up all unique groups:
- 3 sharks with only a good right eye.
- 3 sharks with only a good left eye.
- 3 completely blind sharks.

This gives us **9** sharks in total as the minimum number required to meet all the conditions given in the problem.

### Answer:
There are a minimum of **9 sharks**.

Would you like more details or have any questions?

Here are some related questions you might find interesting:
1. What if one of the sharks could see with both eyes but had partial blindness?
2. How would the solution change if one of the sharks had perfect vision?
3. What would be the minimum number of sharks if each shark could have more than one type of impairment?
4. How can we model this problem using set theory?
5. What other types of problems can be solved using the principle of inclusion-exclusion?

**Tip:** When solving problems involving minimum conditions, always consider overlapping conditions and how they can be minimized through combination.

Un nadador se ve rodeado de un grupo de tiburones, muchos de ellos con problemas de visión. 3 no veían por el ojo derecho, 3 no veían por el ojo izquierdo, 3 podían ver por el derecho, 3 por el izquierdo y 3 tanto por el derecho como por el izquierdo. Otros 3 eran completamente ciegos. ¿Cuántos tiburones había como mínimo?

Discover the minimum number of sharks required based on their visual impairments using combinatorial logic and the principle of inclusion-exclusion. This problem is suitable for students in Grades 10-12, covering essential mathematical concepts in set theory and combinatorics.

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