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 × 0.4 = 0.12
Interpret what the answer 0.12 represents in this equation above.
•the portion of books in the library that are how-to books
• the portion of books in the library that are how-to books on carpentry
•the portion of the how-to books that are about either carpentry or electronics
•the portion of the books in the library that are how-to books on electronics