John found that the average of 15 numbers is 40. If 10 is added to each number then the mean of number is?  Choose the correct choice from the following:
A) 50 B) 60 C) 70 D) 80 E) 90
(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?