The average of 2,7,6 and x is 5 and the average of 18,1,6,x and y is 10. What is the value of y? Choose the correct choice from the following:
A) 5
B) 10
C) 20
D) 30
E) 40
We have : ( 2+7+6+x)/4 = 5 or 15+x =20 or x = 5   Also (18+1+6+x+y)/5 = 10, 25+5+y = 50, y =20   ANSWER:20
<result>C</result>
The average of 2,7,6 and x is 5 and the average of 18,1,6,x and y is 10. What is the value of y?