The difference between the exterior and interior angles at a vertex of a regular polygon is 150 degree. The number of sides of the polygon is	Options
A) 20  B) 21  C) 22  D) 23  E) 24
I+24= 180 deg   I-24= 150 deg   I= 165 deg   24= 15 deg   If there are n vertices (or sides ), then   n*15 = 360 deg ( sum of all external angles)   n= 360/15= 
<gadget id="calculator">360/15</gadget>
<output>24</output>
24   ANSW24R:24
<result>E</result>
The difference between the exterior and interior angles at a vertex of a regular polygon is 150 degree. The number of sides of the polygon is