What are the quantities in this situation ? A rectangular garden is 12 2/3 ft long and has a perimeter of 40ft. How many feet should you add to the width of the garden to make its perimeter 47ft ?

He ! a group of farmers planned to clean 80 acres of wheat per day to finish the work on schedule. right before the work started, they received a new piece of machinery that them clean 10 more acres per day than originally planned. as a result of increased productivity in the last day before the deadline they only had to clean 30 acres. how many acres of wheat did the group of farmers have to clean?