Question

225 grams of flour are needed to make 9 cakes.

Answer 1

So basically, 9 cakes need 225 grams of flour
Therefore 1 cake needs: $\frac{225}{9}$ = 25 grams of flour

Moreover, 20 cakes need: 20 × 25 = 500 grams of flour

500 g > 475 g

Marian does not have enough flour to make 20 cakes