A recipe requires six 1/4 cups of milk. Ran put in to 3/4 cups and empty the container how much more milk does he need to put it

You have 2 sides that are 2 cms and you have 6 sides that are 1/2 cm and you have 4 sides that are 1 cm. the smallest sides are 1/2 the medium sized sides are 1 and the smallest are 1/2. so to find the perimeter you have to add them all up together so your answer will be 11 cm's

12+3b -1=-5-b -12-1+5=-b-3b -8=-4b