In a family 13 people eat only vegetarian, 7 people eat only non veg., 8 people eat both veg and non veg.. How many people eat veg in the family?  Pick one
A) 20	B) 11	C) 9	D) 31	E) 21
Total people eat veg = only veg + both veg and non veg   Total= 13+8= 
<gadget id="calculator">13+8</gadget>
<output>21</output>
21   Answer= 21
<result>E</result>
In a family 13 people eat only vegetarian, 7 people eat only non veg., 8 people eat both veg and non veg.. How many people eat veg in the family?