Hey! I never saw this comment, sorry! Hope that you did find the answer to your question by now, but just in case - you can display variables in Twine by simply writing them within the prose, i.e. "There are $numberOfSheep sheep", and when you run your game its value will appear within the text like this: "There are 43 sheep".
There are cooler things you can do with variables too, a lot covered in the Twine manual: :) https://twinery.org/cookbook/terms/terms_variables