Question

How to books make up 0.3 of the books in the school library one of these 0.2 with carpentry and zero. Four deal with electronics.

Answer 1

To calculate the number of books in each category, we can use ratios.

1) Total number of books in the library:
Let's assume the total number of books in the library is "x".

2) Number of "how-to" books in the library:
Since "how-to" books make up 0.3 (or 0.3x) of the total number of books, we can say:
0.3x = number of "how-to" books in the library

3) Number of "how-to" books on carpentry:
Since 0.2 of the books are on carpentry, we can calculate this as:
0.2 * (0.3x) = 0.06x = number of "how-to" books on carpentry

4) Number of "how-to" books on electronics:
Since 0.4 of the books are on electronics, we can calculate this as:
0.4 * (0.3x) = 0.12x = number of "how-to" books on electronics

Therefore, the number of "how-to" books on carpentry would be 0.06x and the number of "how-to" books on electronics would be 0.12x.