conversations.from: human
conversations.value: A pirate crew is digging for buried treasure on the island marked X on a map. They dug ten holes the first day, thirteen holes the second day, and eight holes the third day. They stopped digging early on the third day to fill in two holes the pirates kept falling in. On the fourth day of digging, they unearthed a treasure chest full of gold, jewels, and an aged hat. The island had four times as many holes by then as it did at the end of the first day. How many holes did the pirates dig on the fourth day before finding the treasure?
conversations.from: assistant
conversations.value: Let X mark the number of holes they dug on the fourth day.
  The island had 4 * 10 = 40 holes when they found the treasure.
  They dug 10 + 13 + 8 = 31 holes the first three days.
  After filling in 2 holes, they had 31 - 2 = 29 holes dug.
  When they found the treasure, they had 29 + X = 40 holes dug.
  Thus, the pirates dug 40 - 29 = 11 holes on the fourth day.