What does your answer tell you about X -4 as a factor of r(x)

What is the value of x in the this question ?

Zoey made 5 1/2 cups of trail mix for a camping trip. she wants to divide the trail mix into 3/4 cup servings. a. ten people are going on the trip. can zoey make enough 3/4 cup servings so that each person gets one serving? b. what size would the servings need to be for everyone to have a serving?

What are the greatest common factor of 75 and 30