1. Hope was collating the pages of the report. She had a stack of each page on the table, just the right number, and was building up a separate stack of complete sets. "So far I've taken as many minutes as there are stacks here," she said. "It's odd all the stacks have the same number of sheets now," said Oscar. She smiled. "Then it should take me exactly one and a half hours to finish if I go on at the same speed." How many pages in each complete set?

7 pages per set

13 pages per set

9 pages per set