conversations.from: human
conversations.value: A frog lays 800 eggs a year.  10 percent dry up, and 70 percent are eaten.  1/4 of the remaining eggs end up hatching, how many frogs hatch out of the 800?
conversations.from: assistant
conversations.value: Dried up:800(.10)=80 eggs
  800(.70)=560 eggs
  Total left:800-80-560=160 eggs
  160/4=40 eggs survive to hatch