The arithmetic mean of nine numbers is 54. If two numbers $u$ and $v$ are added to the list, the mean of the eleven-member list becomes 66. What is the mean of $u$ and $v$?
+37170 54 * 9 = 486
(486 + u+v)/11 =66
486 + u + v = 726
u+v = 240
240/2 =120
