
Need help with conversion
Can someone explain to me how the conversion chart works it says I need a total of 20 units I don't see 20 units on this list does that mean you need more than one bottle? What am I missing here? Sorry if this post is not allowed.
Edit: it's a math problem for me I am not good at math, I only understand in terms of ml and not units so all your calculative support has been great explaining it for me!!!!