Thank you for viewing. This is a textbook used at a cram school. There are some corner folds and tears, but I think it can still be used. Answers included. There is almost no writing, but some problems have marks in pencil, and the head teacher has selected the minimum necessary sections to be done (see images). - Step: Step-by-step learning method - Number of pages: Contains multiple problems and explanations There are no small children, animals, or smokers, so there are no such stains or odors.