conversations.from: human
conversations.value: Can you explain how to solve this math problem: In the engineering department, 70% of the students are men and 180 are women. How many men are there?
conversations.from: assistant
conversations.value: The percentage for women is 100% - 70% = 30%.
  Since 180 represents 30%, then 180/30 = 6 students represent 1%.
  Hence, 6 x 70 = 420 students are men.