Task about subraction game

Question

I failed the test assessment and didn't copy the assignment. If you are familiar with this task, could you please share a link where I can read the condition? The description was something about "subraction game" we have divider=3 and need to find how many time we iterate array before all numbers will divide on 3. Thanks!

[34,56,20,90,100]
[34,56,1800,9000,100]
[3427200,100800,1800,9000,100]
Result 3

Answer 1

Can you Please Elaborate.