conversations.from: human
conversations.value: Francis' family has 2 ukuleles, 4 guitars, and a certain number of violins. Each ukulele has 4 strings. Each guitar has 6 strings. Each violin has 4 strings. If the total number of strings among the ukuleles, guitars, and violins is 40 strings, how many violins does Francis' family have?
conversations.from: assistant
conversations.value: From the ukuleles, there are 2 * 4 = 8 strings
  From the guitars, there are 4 * 6 = 24 strings
  From the violins, there are 40 - 8 - 24 = 8 strings
  The total number of violins Francis' family has is 8 / 4 = 2 violins