Average of 2 Numbers: Find Equation Solution

[alextrainer]

If average of 11 numbers is 14 and average of the 9 of those numbers is 9, what is the average of the other 2 numbers?

Answer 36.5

9x9 = 81 - how do I write equation to figure out other 2 numbers without trial and error?

 

[Greg]

Hi alextrainer and welcome to MHB! :D

$$\frac{81+a+b}{11}=14$$

Can you continue with that?

 

[alextrainer]

Thanks, I got it

a plus b = 154

154/2 = answer

thanks for the equation