conversations.from: human
conversations.value: I'm completely lost with this math problem: Marta was about to start the school year and needed to buy the necessary textbooks. She managed to buy five on sale, for $10 each. She had to order two textbooks online, which cost her a total of $40, and three she bought directly from the bookstore for a total of three times the cost of the online ordered books. How much in total did Martha spend on textbooks?
  Can you give me a hand?
conversations.from: assistant
conversations.value: Marta bought five textbooks on sale, for a total of 5 * 10 = $50.
  Three textbooks from the bookstore had a cost of 3 * 40 = $120.
  That means that Marta spent in total 50 + 40 + 120 = $210 on textbooks.