Position of matrice element

Questions
1

In the list {1,2,10,9} how do I get the position of the element defined by a variable named gage=10, for example. ( the answer would be 3)

Thanks

2

Use Position function.

3

OK Priyan, but my doubt is, I don’t want to use Position[ {1,2,10,9},10]. I want to use the name of variable, in this case “gage” because it can change during calculations. If a use Position[{1,2,10,9},gage] doesn’t work.
Thanks for your reply

4

If a use Position[{1,2,10,9},gage] doesn’t work

It works for me:

gage = 10;
Position[{1, 2, 10, 9}, gage]
(*  {{3}} *)
5

It worked now !!!
I have tried this way before but didn’t work. I don’t know what happened.

Thanks Nasser and Priyan