1. Find out how many females there are by subtracting the total members (21) minus the males (13). 21 - 13 = 8.
2. It is asking for a ratio of females (8) to total club members (21). A ratio can be written with a colon, as a fraction, or with the word "to". Any of these answers would work:
8:21
8/21
8 to 21
