Answer:
12 men
27 guests
Explanation:
If the ratio of men to women at the Christmas party is 4 to 5, and there are 15 women at the party, then there must be 15 * (4/5) = 12 men at the party.
If there are 15 women and 12 men at the party, then there are a total of 15 + 12 = 27 guests at the party.