The gluten - free cupcakes are 80 / 2 = 40. The vegan cupcakes with gluten are 24 / 2 = 12. The non - vegan cupcakes with gluten are 40 - 12 = 28.
This justifies what answer for what question? Q & A:
A mum ordered 80 cupcakes for her daughter's birthday. Half of them are gluten-free. There are 24 vegan cupcakes and half of them are also gluten-free. How many are non-vegan cupcakes that also contain gluten?
28