There are 200 rats in Rat-City. Out of the 200, 70 are street rats and the rest are domestic rats. 110 rats are gray, 30 out of the gray cats are NOT domestic ones. How many domestic rats are there which are not gray in Rat-City?  Choose the correct choice from the following answers:	A) 90	B) 50	C) 60	D) 40	E) 25
SR=70,DR=130   GR=110,NGR=90   So SR,GR30 and DR,GR=80 NGR,SC=40 and NGR,DC=50   SR=stray rats   DR=domesticated rats   GR=Gray rats   NGR=Non Gray rats   Answer is 50)
<result>B</result>
There are 200 rats in Rat-City. Out of the 200, 70 are street rats and the rest are domestic rats. 110 rats are gray, 30 out of the gray cats are NOT domestic ones. How many domestic rats are there which are not gray in Rat-City?