conversations.from: human
conversations.value: Lorin has 4 black marbles. Jimmy has 22 yellow marbles. Alex had twice as many black marbles as Lorin and one half as many yellow marbles as Jimmy. How many marbles does Alex have?
  Find the solution.
conversations.from: assistant
conversations.value: Alex has 2*4=8 black marbles
  Alex has 22/2=11 yellow marbles
  Alex has 8+11=19 marbles