How-to books make up 0.3 of the books in the school library. Of these, 0.2 deal with carpentry and 0.4 deal with electronics. 0.3 x 0.4 = 0.12. Interpret what the answer 0.12 represents in this equation. 1. The portion of the books in the library that are how-to books. 2. The portion of the how-to books that are about either carpentry or electronics. 3. The portion of the books in the library that are how-to books on electronics. 4. The portion of books in the library that are how-to books on carpentry.

The answer 0.12 represents:

3. The portion of the books in the library that are how-to books on electronics.

The answer 0.12 represents option 2: "The portion of the how-to books that are about either carpentry or electronics."

To interpret the answer 0.12 in the given equation, let's break down each of the options:

1. The portion of the books in the library that are how-to books.
The equation 0.3 x 0.4 = 0.12 does not represent the portion of all books in the library that are how-to books. It only represents the intersection of how-to books related to both carpentry and electronics.

2. The portion of the how-to books that are about either carpentry or electronics.
This interpretation is correct. The equation 0.3 x 0.4 = 0.12 represents the portion of how-to books that are about either carpentry or electronics. Since 0.3 represents the fraction of how-to books in the library, and 0.4 represents the fraction that deals with electronics, multiplying these fractions gives the portion that deals with both carpentry and electronics.

3. The portion of the books in the library that are how-to books on electronics.
This interpretation is incorrect. The equation does not directly represent the portion of how-to books on electronics. It only represents the intersection of how-to books related to both carpentry and electronics.

4. The portion of books in the library that are how-to books on carpentry.
This interpretation is incorrect. The equation does not directly represent the portion of how-to books on carpentry. It only represents the intersection of how-to books related to both carpentry and electronics.

Therefore, the correct interpretation is option 2: The portion of the how-to books that are about either carpentry or electronics.