What are two decimals equivalent to 5.300

Based on what i know about mean, this doesn't add up.

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76

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?