Question

sara is reading a 280-page book. if she has read 124 pages, what percent of the book has she not read

Answer 1

\[\frac{280-124}{280} \times 100\]

Answer 2

(Pages unread)/(total pages) *100

Answer 3

This is similar to percent increase/decrease

Answer 4

But in general it is a percent change problem with the general form:

\[\% \Delta = \frac{|a - b|}{a} \times 100\] where:

a = original amount
b = new amount