conversations.from: human
conversations.value: A magician has a top hat with 20 red marbles and a top hat with 30 blue marbles. If he takes away 3 red marbles and four times as many blue marbles as red marbles (without looking), how many marbles in total does he have left?
  Work out the solution step by step.
conversations.from: assistant
conversations.value: He had 20 red marbles and took away 3 leaving 20-3 = 17 red marbles
  He took 4 times as many blue marbles as red marbles which is 4*3 = 12 blue marbles
  He took 12 blue marbles from 30 leaving 30-12 = 18 blue marbles
  He now has 17+18 = 35 marbles left