At the library, you find 9 books on a certain topic. The librarian tells you that 55% of the books of this topic have been signed out. How many books does the library have on this topic?

20books

Step-by-step explanation:

Let x be the initial number of books on the shelf,

If 55% of the books have been signed out, then 45% (100-55) of the total books would have been left on the shelf i.e 45%of x

Since I found 9 books on the topic, we will equate 45%of x to 9 to get the initial number of books on the topic that is;

45x/100 = 9

45x = 900

x = 900/45

x = 20

This shows that the library has 20books on the topic

step-by-step explanation:

do you have a copy of the table?

a line is an defined derm because it

a)contains an infinite number of points b) can be used to create other geometric shapes c)describes something that does not have width or depth d) is a term that does not have a formal definition. a line is an undefined term because it: contains an infinite number of points.