conversations.from: human
conversations.value: I need help with this problem:
  A vampire needs to suck 7 gallons of blood per week to survive.  If he sucks 2 pints of blood per person, how many people does he need to suck each day to survive?
conversations.from: assistant
conversations.value: Each day it needs to consume 7/7=1 gallon of blood
  There are 128/16=8 pints per gallon
  So he needs to suck blood from 8/2=4 people per day