Me. walker needs 22 cups of flour to bake 12 cakes. how many cups of. flour will she need to bake 30 cakes?

We can infer that more cups of flour are needed as the cakes are increased, so we can apply a rule of three, simple with direct proportion to find the
12 cakes > 22 cups flour
30 cakes > x

x = (30)(22)/12
x = 55
therefore 55 cups of flour are needed to bake 30 cakes

Aand b are correctly balanced reactions. they have the same number of atoms in both sides of the reaction