Final answer:
To find the fraction of the choir made up of men and women, add the fractions 1/9 and 1/4.
Step-by-step explanation:
To find the fraction of the choir made up of men and women, we first need to determine the fractions of men and women separately. We are given that men are 1/9 of the choir and women are 1/4 of the choir. To find the fraction of men and women combined, we need to add the two fractions together.
1/9 (men) + 1/4 (women) = 4/36 + 9/36 = 13/36
Therefore, the fraction of the choir made up of men and women is 13/36.