conversations.from: human
conversations.value: I need help with this problem:
  A club with 30 members ordered fruit juices. Two-fifths of them ordered lemon juice. One-third of the remaining members ordered mango juice, and the rest ordered orange juice. How many members ordered orange juice?
conversations.from: assistant
conversations.value: 30 x 2/5 = 12 members ordered lemon juice.
  So, 30 - 12 = 18 members did not order lemon juice.
  Since 1/3 of the remaining ordered mango juice, then 18 x 2/3 = 12 members ordered mango juice.
  Therefore, 18 - 12 = 6 members ordered orange juice.