Townville has 100 residents, and 20 of them are females. If half of Townville’s male residents are smokers, and 1/2 of the female residents are smokers, which of the following represents the total number of Townville’s residents who are NOT smokers?	Pick one:
A) 40
B) 45
C) 50
D) 55
E) 60
Number of people =100   Females = 20   men = 100-20= 
<gadget id="calculator">100-20</gadget>
<output>80</output>
80   Half of the men are smoker  80/2= 
<gadget id="calculator">  80/2</gadget>
<output>40</output>
40, that means the remaining men 80-40= 
<gadget id="calculator">80-40</gadget>
<output>40</output>
40 are non smokers.   1/2 females are smoker. i.e 1/2*20= 10   20-10= 
<gadget id="calculator">20-10</gadget>
<output>10</output>
10 females are non smokers   So, total number of non smokers in the town are 40+10= 
<gadget id="calculator">40+10</gadget>
<output>50</output>
50   Answer : 50
<result>C</result>
Townville has 100 residents, and 20 of them are females. If half of Townville’s male residents are smokers, and 1/2 of the female residents are smokers, which of the following represents the total number of Townville’s residents who are NOT smokers?