Question 772622
 2)the average of two numbers is A. if one of the numbers is x, the other number is? 
:
let y = the other number
 {{{(x+y)/2}}} = A
solve for y
multiply both sides by 2
x + y = 2A
subtract x from both sides
y = 2A - x
:
The other number is (2A-x)