conversations.from: human
conversations.value: Can you break down the solution for me for this math problem: George donated half his monthly income to charity and spent $20 from the other half on groceries. If he now has $100 left, how much was his monthly income?
conversations.from: assistant
conversations.value: Half his monthly income is $100+$20 = $120
  His monthly income therefore is 2*$120 = $240