Numbers in Buddhism are usually symbolic, rather than representations of actual physical or mathematical quantities. Therefore, the numbers seven and eight in Buddhism do not necessarily represent the actual physical quantities or mathematical quantities.
For example, in Buddhism, the number seven is often used to represent seven basic elements (earth, water, fire, wind, qi, knowledge and meaning) or seven sensory branches (mindfulness, mindfulness, righteousness, longevity, diligence and convenience). In addition, the number eight is also used in Buddhism to represent eight directions (east, south, west, north, southeast, southwest, northeast and northwest) or eight right paths (right view, mindfulness, righteousness, righteousness, diligence, mindfulness and positive determination).
Therefore, the numbers seven and eight in Buddhism are not directly related, but only used to symbolize a certain idea or thing.