Question 274502
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Let *[tex \Large x] represent the number of women.  Then the number of men must be  *[tex \Large x\ -\ 20].  The sum of these two quantities is 620 (unless there is some unspecified third gender included in the total student population), so:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ x\ +\ x\ -\ 20\ =\ 620]


Just solve for *[tex \Large x]


John
*[tex \LARGE e^{i\pi} + 1 = 0]
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