Asap jessica had m beads. she used 18 of them to make a necklace for her mom. then she used the rest to make k bracelets for her friends, with the same number of beads in each bracelet. how many beads did she use to make each bracelet?

The initial number of beads is:
 m
 After making a necklace for her mom, the number of pearls is:
 m-18
 For each bracelet, the number of pearls is:
 N = (total amount of beads) / (number of bracelets)
 Substituting values:
 N = (m-18) / k
 
 she used to make each bracelet about:
 N = (m-18) / k beads