human
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?
assistant
How much did George donate? ** Half his monthly income is $100+$20 = $<<100+20=120>>120
How much was George's monthly income? ** His monthly income therefore is 2*$120 = $<<2*120=240>>240
#### 240