You have 750ml's of a solution that was originally made up using a 20X stock. How much stock was used?

Question

I think the answer is 3.75 by dividing 750/20 but I am not sure

Answer 1

It makes no sense, unless the 20x means the stock solution was diluted 20 times, which would have been 1 Part stock, 19 parts water.

one part then would have been 75ml.

Answer 2

thank