Agnes and Bryn both buy identical pizzas to share with friends. Agnes gives Carwyn of her pizza. Bryn shares his pizza in the ratio 1:2:3:4 and gives Dafydd the largest piece. Does Carwyn have: the same size piece of pizza as Dafydd, or a larger piece of pizza than Dafydd, or a smaller piece of pizza than Dafydd? You must explain your answer and show all your working. [3]