conversations.from: human
conversations.value: Anna has 3 times as many toys as Mandy and 2 fewer toys than Amanda. If they have 142 toys all together, how many toys does Mandy have?
  Solve this problem.
conversations.from: assistant
conversations.value: Let x be the number of toys Mandy has.
  Anna has 3*x toys.
  Amanda has 3*x+2 toys.
  x+3*x+3*x+2=142
  7*x+2=142
  7*x=140
  x=20