Respuesta :

5p where p is the number of pairs of sock, which has to be whole number.

Since 5 is a whole number and p is a whole number, therefore, 5p must be a whole number.
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Answer:

Step-by-step explanation:

p must be a whole number because $5 which is the cost of socks per pair is a perfect divisor of the expression 5p.

i.e 5p/5 = p

And in the expression p represent number of pairs