in a class of 25 students, 15 play hockey and 16 play basketball. if there are 4 students who play neither sport, determine the number of students who play both hockey and basketball?	Choose the correct option: A) 10 B) 11 C) 13 D) 14 E) 15
Let the number of who play both be x   Number of students who play sports 25-4= 
<gadget id="calculator">25-4</gadget>
<output>21</output>
21   Use Venn diagram   (15-x)+x+(16-x)=21   Which gives x=10   10nswer is 10   10 play both sport
<result>A</result>
in a class of 25 students, 15 play hockey and 16 play basketball. if there are 4 students who play neither sport, determine the number of students who play both hockey and basketball?