In a group of 100 people,50 like reading books,20 like both reading books and listening songs. How many like listening songs?  Options:
A) 40 B) 50 C) 70 D) 60 E) None
Make a Venn diagram, and enter your data.   Let the number of people who like Listening Songs be x   x + 20 + 30 = 100   x = 50   so number who like Listening Songs = 20+50= 
<gadget id="calculator">20+50</gadget>
<output>70</output>
70   Answer 70
<result>C</result>
In a group of 100 people,50 like reading books,20 like both reading books and listening songs. How many like listening songs?