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 is equal to 20 ?

Dividing the socks into five equal groups means the number in each group is the total number of socks divided by 5, or s ÷ 5. Substituting s = 20 gives 20 ÷ 5 = 4 socks per group. So the correct choice is “s over 5; when s is equal to 20, the number of socks in each group is 4.”

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