If $X$ is the average of $Y$ numbers, what is $Y?$

If $X$ is the average of $Y$ numbers, what is $Y?$

(1) $X = 54.5$

(2) The sum of the $Y$ numbers for which $X$ is the average is $2,616.$

[spoiler]OA=C[/spoiler]

Source: Manhattan GMAT

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