conversations.from: human
conversations.value: Provide a step by step solution for the following math problem: At a roller derby, 4 teams are competing. Each team is made up of 10 members, and each member needs a pair of roller skates to compete in and another pair of skates as a backup. None of the skates have laces yet, so each member is offered 3 sets of laces per pair of skates. How many sets of laces have been handed out?
conversations.from: assistant
conversations.value: There are a total of 4 teams * 10 members per team = 40 team members.
  Each person receives 1 pair of competing roller skates + 1 pair of backup roller skates = 2 pairs of roller skates.
  So there are a total of 40 team members * 2 pairs of roller skates per team member = 80 roller skates.
  There were therefore 80 roller skates * 3 sets of laces per pair of roller skates = 240 sets of laces handed out.