Townville has 100 residents, and 60 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?  Choose the correct choice from the following choices:
A) 48	B) 50	C) 52	D) 54	E) 56
Number of people =100   Females = 60   men = 100-60= 
<gadget id="calculator">100-60</gadget>
<output>40</output>
40   Half of the men are smoker  40/2= 
<gadget id="calculator">  40/2</gadget>
<output>20</output>
20, that means the remaining men 40-20= 
<gadget id="calculator">40-20</gadget>
<output>20</output>
20 are non smokers.   1/2 females are smoker. i.e 1/2*60= 30   60-30= 
<gadget id="calculator">60-30</gadget>
<output>30</output>
30 females are non smokers   So, total number of non smokers in the town are 20+30= 
<gadget id="calculator">20+30</gadget>
<output>50</output>
50   Answer : 50
<result>B</result>
Townville has 100 residents, and 60 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?