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15 July, 12:41

Socks cost $5 per pair. The expression 5p represents the cost in dollars of p pairs of socks. Why must p be a whole number?

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  1. 15 July, 16:06
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    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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