To find the number of how-to books in the school library that deal with carpentry, multiply the total number of how-to books by the proportion that deal with carpentry:
0.3 x 0.2 = 0.06.
Similarly, to find the number of how-to books in the school library that deal with electronics, multiply the total number of how-to books by the proportion that deal with electronics:
0.3 x 0.4 = 0.12.
Therefore, there are 0.06 carpentry how-to books and 0.12 electronics how-to books in the school library.
1. How-to books make up 0.3 of the books in the school library. Of these how-to books, 0.2 deal with carpentry and 0.4 deal with electronics.
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