conversations.from: human
conversations.value: Sarah's external drive showed 2.4 gigabytes free and 12.6 gigabytes used. She decided to delete a folder of size 4.6 gigabytes and store new files of 2 gigabytes. If she will transfer all her files to a new external drive of size 20 gigabytes, how many free gigabytes will the new external drive have?
conversations.from: assistant
conversations.value: There were 12.6 - 4.6 = 8 gigabytes used after deleting some files.
  Then, the used space went up to 8 + 2 = 10 gigabytes after storing other files.
  Thus, the new 20 gigabytes external drive will have 20 - 10 = 10 gigabytes free.