Let's first define the variables:
 x = number of weeks.
 y = number of boxes after x weeks.
 We write the inequation that adapts to the problem
 y> -65x + 460
 For a number less than 100 boxes we have:
 100> -65x + 460
 We clear x:
 65x> -100 + 460
 65x> 360
 x> (360/65)
 x> 5.54
 Answer:Â
 it will take more than 5.54 weeks for the warehouse to have less than 100 boxes