45 pupil,out of them 12 in debate only and 22 in singing only.then how many in both? Choices:
A) 9  B) 10  C) 11  D) 12  E) 13
The intersection for two = 45 - 12 - 22= 
<gadget id="calculator">45 - 12 - 22</gadget>
<output>11</output>
11 play both games.   ANSWER:11
<result>C</result>
45 pupil,out of them 12 in debate only and 22 in singing only.then how many in both?