conversations.from: human
conversations.value: I need a clearer understanding of how to solve: Oliver has 10 $20 and 3 $5 bills. William has 15 $10 and 4 $5 bills. How much more money does Oliver have than William?
conversations.from: assistant
conversations.value: Oliver's $20 bills amount to $20 x 10 = $200.
  Oliver's $5 bills amount to $5 x 3 = $15.
  So, Oliver has a total of $200 + $15 = $215.
  William's $10 bills amount to $10 x 15 = $150.
  William's $5 bills amount to $5 x 4 = $20.
  So, William has a total of $150 + $20 = $170.
  Therefore, Oliver has $215 - $170 = $45 more than William.