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 on carpentry
the portion of the books in the library that are how-to books on electronics
the portion of books in the library that are how-to books
the portion of the how-to books that are about either carpentry or electronics