Elisha plans to install a new ceiling in her basement. Each ceiling tile covers an area of 1.25 m2. The area of the basement ceiling is 50 m2. If Elisha has only 21 ceiling tiles, what percent of the ceiling can she tile?

She needs 50 m^{2 }/ 1.25 m^{2}/tile = 40 tiles for a complete ceiling

21 tiles / 40 tiles x 100% = ........... % covered with only 21 tiles

21/40= % 52.5 kaplamistir.