The average age of 5 girls is 7. The oldest among them is 15 years old. What is the average age of others?
Select the correct option:
A) 9 B) 6 C) 7 D) 8 E) 5
sum of ages of girls = 35   sum of ages of rest of 4 girls=20   average=20/4= 
<gadget id="calculator">20/4</gadget>
<output>5</output>
5   ANSW5R:5
<result>E</result>
The average age of 5 girls is 7. The oldest among them is 15 years old. What is the average age of others?