The arithmetic mean of nine numbers is 54. Of two number u and v are added to the list the mean of the eleven numer list becomes 66. what are the values of u and v?
The arithmetic mean of nine numbers is 54. Of two number u and v are added to the list the mean of the eleven numer list becomes 66. what are the values of u and v?
Hello, Dragon,
the sum of the first nine numbers is: 9 * 54 = 486.
So your problem becomes:
$\displaystyle \frac{9*54+u+v}{11}=66$
That means: u + v = 240
or: u = 240 - v
So you can construct a pair of numbers with this property.