"Alright, so we assume that we average somewhat above a passing grade, because in the natural state of things we probably wouldn't all do much better than passing," said Seamus, writing 75% x 6 at the top of a sheet of parchment. "And Hermione gets a perfect score, because all know she would." He wrote below the first line, + 100% x 1, and then underneath that drew a division line and wrote 7, and then stared at it for a second. Then he scratched out the arithmetic by hand, because he wasn't actually all that much better at math than the rest of them, he'd just done okay in his Muggle primary school (Dean and Parvati had also attended Muggle primary schools, unlike the others who'd been homeschooled, but Dean had spent his math class doodling on his notebook and Parvati had spent hers annoying Padma).