Final answer:
Amelia needs 104.625 yards of fabric to make 31 uniforms.
Step-by-step explanation:
To find out how many yards of fabric Amelia needs to make 31 uniforms, we need to multiply the amount of fabric needed for one uniform by the number of uniforms:
3.375 yards/uniform x 31 uniforms = 104.625 yards
Therefore, Amelia needs 104.625 yards of fabric to make 31 uniforms.