Deon has 12 milliliters of 5% solution. he also has a solution that has a concentration of 30%. how many milliliters of the 30% solution does deon need to add to the 5% solution to obtain a 20% solution

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?