Question 262810
Let X, Y, and Z be the 3 numbers. Ten we get
{{{V = (x+y+z)/3)}}}
The remaining number is x.
---
step 1 - multiply by 3 to get
{{{3V = x + y + z}}}
step 2 - subtract y and z to get x as
{{{3V-Y - Z = X}}}