conversations.from: human
conversations.value: Uriah's book bag is getting too heavy for him. He needs to remove 15 pounds from it. His comic books weigh 1/4 pound each and his toys weigh 1/2 pound each. If he removes 30 comic books, how many toys does he need to remove?
  How to solve this?
conversations.from: assistant
conversations.value: 30 comic books weigh 7.5 pounds because 30 x .25 = 7.5
  He needs to remove 7.5 more pounds because 15 - 7.5 = 7.5
  He needs to remove 15 toys because 7.5 / .5 = 15