GMAT Problem Solving (PS) | Re: If there are 56 people attending a birthday party which of the followi

Since there are 56 TOTAL people at the party, we can create the following expression:

56/(ratio of men + ratio of women) = integer
Thus, when we sum the ratio of men and the ratio of women, we must get a factor of 56. Let’s test the answer choices:

A) 10 : 9

Since 10 + 9 = 19, and 19 is not a factor of 56, answer choice
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