Why won't Variable A equal Variable B

Question

Hello all
I have a page in my Flash file where a user can select one of three values, and it will add or subtract from the variable I have on Frame 1.
So on Frame 1 I say:
var f2f:Number = 5;
var coach:Number = 5;
var mentor:Number = 5;
And on Frame 13 I was saying:
btnP13toP14.addEventListener(MouseEvent.CLICK, NavPage14);
btnContentSmall.addEventListener(MouseEvent.CLICK, contentSmall);
btnContentLarge.addEventListener(MouseEvent.CLICK, contentLarge);
function contentSmall(event:MouseEvent):void
f2f = -10
coach = -10
mentor = -10
function contentLarge(event:MouseEvent):void
f2f = +10
coach = +10
mentor = +10
But it occurred to me that if the user clicks on btnContentSmall, and then on btnContentLarge, the values would become 5, rather than 10. 
So now what I am trying to do is add temporary variables to Frame 13 that store the correct value, and then update the original values when I go to the next frame (which will have a similar process).
Here is what I have now on Frame 13:
btnP13toP14.addEventListener(MouseEvent.CLICK, NavPage14);
btnP13toP14.addEventListener(MouseEvent.CLICK, copyBack);
btnContentSmall.addEventListener(MouseEvent.CLICK, contentSmall);
btnContentLarge.addEventListener(MouseEvent.CLICK, contentLarge);
var f2fTemp:Number = f2f;
var coachTemp:Number = coach;
var mentorTemp:Number = mentor; 
function contentSmall(event:MouseEvent):void
f2fTemp = f2f-10
coachTemp = coach-10
mentorTemp = mentor-10
function contentLarge(event:MouseEvent):void
f2fTemp = f2f+10
coachTemp = coach+10
mentorTemp = mentor+10
function copyBack(event:MouseEvent):void
f2f = f2fTemp;
coach = coachTemp;
mentor = mentorTemp;
trace ("I ran the CopyBack script");
The Trace statement on the last function is displayed, but when I trace the variables on Slide 14, the f2f, coach and mentor variables have not updated: they are still all 5.
Does anyone have any idea what I'm doing wrong?  I found one website that said I might need to use a class; but I didn't really understand how to translate that information into a solution.
Thank you
M Hetherington

Answer 1

For the scenario you just outlined at the end, if you want the value to be 15 then you need to assign it a value of 15. 
In your first posting, in the first part, you were doing more like what you say you want to do...
f2f = +10
coach = +10
mentor = +10
Those are not adding 10 to the current value of those variables, they are assigning fixed values...  +10 = 10,   -10 = -10, etc
What you explained just now sounds like you wanted to try to have...
f2f += 10
coach += 10
mentor += 10
those would be adding 10 to the current value, so -5 would become +5 and 5 would become 15
But what you just said is that if you click the btnContentLarge button you want the value to be 15 regardless of what the current value is... so that means you needs to assign it a value of 15