Of the 130 employees at company X, 80 are full-time, and 100 have worked at company X for at least a year. There are 20 employees at company X who aren’t full-time and haven’t worked at company X for at least a year. How many full-time employees of company X have worked at the company for at least a year?	Choose one
A) 20	B) 30	C) 50	D) 80	E) 100
Full time employee who have NOT worked for at least one year = a   Full time employee who have worked for at least one year = b   NON Full time employee who have worked for at least one year = c   NON Full time employee who have NOT worked for at least one year = d   a+b+c+d = 150   a+b = 80   i.e. c+d = 70   b+c = 100   i.e. a+d = 50   d = 20   i.e. c = 70-20= 
<gadget id="calculator">70-20</gadget>
<output>50</output>
50   i.e. b= 100-50= 
<gadget id="calculator">100-50</gadget>
<output>50</output>
50   i.e. a= 80-50= 
<gadget id="calculator">80-50</gadget>
<output>30</output>
30   b= 30   Answer: Option 30
<result>B</result>
Of the 130 employees at company X, 80 are full-time, and 100 have worked at company X for at least a year. There are 20 employees at company X who aren’t full-time and haven’t worked at company X for at least a year. How many full-time employees of company X have worked at the company for at least a year?