45 pupil, out of them 12 in debate only and 22 in singing only. then how many in both? Pick one.
A) 9
B) 10
C) 11
D) 12
E) 13
<gadget id="calculator">12 + 22</gadget>
<output>34</output>

<gadget id="calculator">45 - 34</gadget>
<output>11</output>

<result>C</result>
45 pupil, out of them 12 in debate only and 22 in singing only. then how many in both?
subtract(45, add(12, 22))
the intersection for two = 45 - 12 - 22 = 11 play both games . answer : c