question: Bob spends $27000 distributed between 3 schools to buy books.  He can buy 100 books for $500.  How many books can he buy per school?
answer: He spends 27000/3=$<<27000/3=9000>>9000
  Each book cost 500/100=$<<500/100=5>>5
  So he can buy 9000/5=<<9000/5=1800>>1800 books per school
  #### 1800