How to books make up 0.3 of the books in the school library. Of these, 0.2 deal with carpentry, and 0.4 with electronics
To calculate the proportion of books in the school library that deal with carpentry and electronics separately, you can follow these steps:
1. Determine the proportion of how-to books in the library: 0.3
2. Multiply the proportion of how-to books by the proportion that deals with carpentry: 0.3 x 0.2 = 0.06
3. Multiply the proportion of how-to books by the proportion that deals with electronics: 0.3 x 0.4 = 0.12
Therefore, the proportion of books in the school library that deal with carpentry is 0.06, and the proportion that deal with electronics is 0.12.
To find out how many books in the school library deal with carpentry and electronics, we will use the information given:
Step 1: Determine the total number of books in the school library.
Let's represent the total number of books in the school library as "x."
Step 2: Calculate the number of books that are "how-to" books.
According to the information given, "how-to" books make up 0.3 (or 30%) of the books in the school library.
So, the number of "how-to" books can be calculated as 0.3 * x.
Step 3: Calculate the number of books that deal with carpentry.
Of the "how-to" books, 0.2 (or 20%) deal with carpentry.
So, the number of books that deal with carpentry can be calculated as 0.2 * (0.3 * x), which simplifies to 0.06 * x.
Step 4: Calculate the number of books that deal with electronics.
Of the "how-to" books, 0.4 (or 40%) deal with electronics.
So, the number of books that deal with electronics can be calculated as 0.4 * (0.3 * x), which simplifies to 0.12 * x.
In summary, the number of books in the school library that deal with carpentry is 0.06 * x, and the number of books that deal with electronics is 0.12 * x.