20cm cake serves 12 people costs 13.50 per cake and 25cm cake serves 20 people costs 18.75 . There will be 57 guests and want to make sure everyone gets a slice . Want to pay as little for the cakes and want the cakes to be the same size how much will I have to pay for the cakes

Question

20cm cake serves 12 people costs 13.50 per cake  and 25cm cake serves 20 people costs 18.75 . There will be 57 guests and want to make sure everyone gets a slice . Want to pay as little for the cakes and want the cakes to be the same size how much will I have to pay for the cakes

anonymous · Answer

Refer to the attachment from Mathematica 9.