Henry divided his socks into five equal groups. let s represent the total number of socks. which expression and solution represent the number of socks in each group if s = 20? (a) startfraction s over 5 endfraction; when s = 20, the number of socks in each group is 4. (b)startfraction s over 5 endfraction; when s = 20, the number of socks in each group is 15. (c)s minus 5; when s = 20, the number of socks in each group is 4. (d)s minus 5; when s = 20, the number of socks in each group is 15.