200 ÷ n = x (or something similar) To now how many sand dollars each friend will receive we need to now how many friends there are so we can divide the sand dollars up!
200\n = x you need to be able to divide the sand dollars equally between n friends so 200 divided by N is X which is the amount of sand dollars each friend gets
You would need to find the length of one wall then multiply it by 2 (since there are 2 walls) and then find the width and also multiply that by 2 and you would then add your to products (answers) to get the total length of your border
