40 persons like apple. 7 like orange and mango dislike apple. 10 like mango and apple and dislike orange. 6 like all. How many people like apple?	Answers
A) 47  B) 49  C) 54  D) 58  E) 62
orange+mango-apple=7   mango+apple-orange=10   apple=40   orange+mango+apple=6   40+10+6-7= 
<gadget id="calculator">40+10+6-7</gadget>
<output>49</output>
49 like apple   ANSWER:49
<result>B</result>
40 persons like apple. 7 like orange and mango dislike apple. 10 like mango and apple and dislike orange. 6 like all. How many people like apple?