conversations.from: human
conversations.value: Solve the math problem: It takes Polly 20 minutes to cook breakfast every day. She spends 5 minutes cooking lunch. She spends 10 minutes cooking dinner 4 days this week. The rest of the days she spends 30 minutes cooking dinner. How many minutes does Polly spend cooking this week?
conversations.from: assistant
conversations.value: Polly spends 20*7 =140 minutes cooking breakfast.
  She spends 5*7= 35 minutes cooking lunch.
  She spends (10*4)+(30*3)= 130 minutes cooking dinner.
  Therefore, she spends 140+35+130=305 minutes cooking this week.