Daniel has read 10​% of a book. He has 72 more pages to finish. How many pages are there in the​ book?

Question

Please Help Me I don't get it, for me it is a little hard to get the answer correct.

Answer 1

He read 10% of the book, so 90% remains to be read. That 90% consists of 72 pages, so

72 = 0.90n

n = 72 / 0.90 = 80

There are 80 pages total in the book.