Question

X

Andre and Elena are reading the same book over the
summer. Andre says he has read of the book.
5
Elena says she has read 20 more pages than Andre. If
Elena is on page 55, how many pages are in the book?
Lin has drawn a diagram to solve this question.
Find her error. Then explain her mistake. Use the
sketch tools to help.

Answer 1

the book should have a total of 175 pages

Step-by-step explanation:

Let the total number of pages in the book = X

Andre = 1/5 of X

Elena = 55 pages

Elena = 1/5 of x + 20 pages

55 pages = (1/5)x + 20 pages

55 - 20 = (1/5)x

35 = (1/5)x

x = 35 / (1/5)

x = 175

So the book has a total of 175 pages

Not 100% sure what the diagram means, but

Based on Lin's diagram, it seems like the book has 275 pages, which is not true.