12...? I think?
Since she has 9 left and it only says that she gave 3 away..
The answer to you question is b = 2537.5 I think
I believe the answer is 136.5g
The pages that have diagrams is an illustration of proportions
0.46% pages have diagrams
<h3>How to determine the percentage</h3>
The given parameters are:
Total = 650 pages
Diagrams = 3 pages
The percentage of page that has diagram is then calculated as:

So, we have:

Evaluate the product

Divide

Hence, 0.46% pages have diagrams
Read more about proportions at:
brainly.com/question/1781657