Joey has 30 pages to read for history class tonight. He decided that he would take a break when he finished reading 70% of the pages assigned. How many pages must he read after he takes a break?
Joey will take a break after 30 * 0.7 = <<30*0.7=21>>21 pages
Joey will have to read 30 - 21 = <<30-21=9>>9 pages more.
#### 9