Mike and Fiona are baking blueberry muffins. For every 30 blueberries Mike uses, Fiona uses 50. They use 400 blueberries in total. How many blueberries does Fiona use?

Louis wants to carpet the rectangular floor of his basement the basement has an area of 864 square feet the width of the basement is 2/3 its length what is the length of lewis's basement