conversations.from: human
conversations.value: Provide a step by step solution for the following math problem: Lyka wants to buy a smartphone worth $160 but she only has $40 at the moment. She plans to save an equal amount of money per week for two months for the remaining amount that she needs. How much should she save per week?
conversations.from: assistant
conversations.value: Lyka has to save a total of $160 - $40 = $120 for two months.
  There are 2 x 4 = 8 weeks in two months.
  Hence, Lyka needs to save $120/8 = $15 per week.