Carly surveyed some of her fellow students to determine their fears concerning spiders & snakes. She organized the data into the two-way frequency table below. 

	Spiders	Snakes	Both	Neither	Total
Boys	9	8	3	2	23
Girls	12	10	5	1	27
Total	21	18	8	3	50

What is the joint realative frequency of the students surveyed who were girls and are equally afraid of both snakes and spiders?