Welcome to the Bunnings Workshop community @wherespommie. It's great to have you join us and many thanks for your question.
All our hybrid flooring states the square meterage it covers in the description. Simple divide 27 by the coverage of the product and that will tell you how many packs you'll need.
For example, we'll use Smart Flooring 1.823sqm Highland Grey Waterproof Hybrid Vinyl Planks. Its coverage is 1.823sqm. If this is the product you wanted to use it would be 27 divided by 1.823 which equals 14.8 packs. You'll need to round this up to 15 packs. I would suggest purchasing 16 packs in case there are any anomalies as you can always return the unused pack later.
If you can provide details of the product you wish to purchase then I would be more than happy to work our how many packs you need.