A company has 60 employees, of which 22 studied accounting, 15 studied finance and 14 studied marketing. Nine employees have done just two courses and only one made ​​the three courses. How many employees have no training?
Choose the correct choice from the following options:
A) A)0 B) B)9 C) C)10 D) D)20 E) E)26
Total employees=60   studied accounting=22   studied finance=15   studied marketing=14   9 employees have been double counted and one employee has been counted thrice.   Therefore employees who have received training=22+15+14-9-(2*1)   =51-11= 
<gadget id="calculator">51-11</gadget>
<output>40</output>
40   Employees with no training=60-40= 
<gadget id="calculator">60-40</gadget>
<output>20</output>
20   Ans=20
<result>D</result>
A company has 60 employees, of which 22 studied accounting, 15 studied finance and 14 studied marketing. Nine employees have done just two courses and only one made ​​the three courses. How many employees have no training?