There are two shelves A and B.The number of books in shelf A is 50 more than in shelf B..Then 20 books are removed from each shelf..Then the number of books in shelf A is twice the number of books in shelf..what are the number of books in shelf A originally?  Choose the correct choice from the following answers
A) 100 B) 115 C) 130 D) 120 E) 140
consider the books in B is x,then A has x+50,now 20 books are removed from both A&amp;B then A has x+30,B has x-20,now books in A will be twice of books in shelf B   so x+30=2(x-20) solve this eq gives x=70 so initially A has 120 books   ANSWER:120
<result>D</result>
There are two shelves A and B.The number of books in shelf A is 50 more than in shelf B..Then 20 books are removed from each shelf..Then the number of books in shelf A is twice the number of books in shelf..what are the number of books in shelf A originally?