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.

Answer 1

To find how many books in the school library are how-to books, you can multiply the total number of books by the percentage of how-to books:

Total number of books in the library * Percentage of how-to books

Let's assume there are 100 books in the school library.

Total number of books in the library = 100

Percentage of how-to books = 0.3

Number of how-to books = 100 * 0.3 = 30

Out of these how-to books, 0.2 deal with carpentry.

Number of carpentry books = 30 * 0.2 = 6

And 0.4 deal with electronics.

Number of electronics books = 30 * 0.4 = 12

So, there are 6 carpentry books and 12 electronics books in the school library.