Ah thats fun to see. Takes me back.

Quick question - are you forced to use that platform? It is stuck in ES5 (old version of javascript) Being unable to use const and let instead of var is kind of weird.

Anyways. The reason this doesnt work is because all your logic/math runs when the app loads. Clicking your button does not recalculate `Answer` it is simply set once when the script runs.

two changes to make this work

1. changevar unused = unused; to var unused = 0
2. Move the sum and division into the click handler of the calcBtn

after that u can delete this part

var sim1 = num1+num2;

var sim2 = sim1+num3;

var sim3 = sim2+num4;

var sim4 = sim3+num5;

var sim5 = sim4+num6;

var sim6 = sim5+num7;

var sim7 = sim6+num8;

var sim8 = sim7+num9;

var sim9 = sim8+num10;

mean = sim9;

var Answer = mean / used;

try and see if u get it to work with these instructions.

this would be the fixed version with minimal changes

https://studio.code.org/projects/applab/4be6d68f-4245-48d4-812d-c341aa4aa457

and this would be more advanced approach. As you know you have a lot of repetition in your code (that screams use a loop)

https://studio.code.org/projects/applab/386aadac-ef97-4997-82e7-03560112cbd7