conversations.from: human
conversations.value: I would love to understand how to solve this problem: Mathilda is determined to pay back the money she owes a friend so she decides to pay an initial installment of $125. If she still has 75% left to pay, how much did she owe originally?
  Can you explain?
conversations.from: assistant
conversations.value: Percentage means per 100, so if she still owes 75%, she must have paid 100% - 75% = 25% of the original amount.
  25% of the original amount = (25/100)*original amount = $125
  Multiplying both sides by (100/25) gives: original amount = (100/25)*$125 = $500