John found that the average of 15 numbers is 40. If 10 is added to each number then the mean of number is?  Pick:
A) 50
B) 60
C) 75
D) 80
E) 85
(x+x1+...x14)/15 = 40   50   Option 50
<result>A</result>
John found that the average of 15 numbers is 40. If 10 is added to each number then the mean of number is?