There are 8 boxes of 630 planners total, weighing a total of 330 lbs, how many planners are in each box?

630/8 = 78.75

Since you can't have a fraction of a planner, you can have some boxes with 78 planners and other boxes with 79 planners. There is no statement that the number of planners in each box is equal or similar, so you can have 7 boxes with 1 planner in each, and 1 box with 623 planners.