John found that the average of 15 numbers is 40. If 13 is added to each number then the mean of number is?
Answers:  A) 53  B) 45  C) 65  D) 78  E) 64
(x+x1+...x14)/15 = 40   53   Option 53
<result>A</result>
John found that the average of 15 numbers is 40. If 13 is added to each number then the mean of number is?