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?
The gluten-free cupcakes are 80 / 2 = <<80/2=40>>40.
The vegan cupcakes with gluten are 24 / 2 = <<24/2=12>>12.
The non-vegan cupcakes with gluten are 40 - 12 = <<40-12=28>>28.
#### 28