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

Answer 1

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.