24 is 16 multiplied by 1.5: 1.5*16=24
that means that we have to multiply all the amounts of the ingredients by 1.5 to keep the same ratio and make more gingerbread:
180 g flour*1.5=270 grams flour
40 g ginger *1.5=60 grams ginger
110 g butter *1.5 =165 gram butter
30 g sugar*1.5=45 grams sugar