Why is math stu pid? It is no point? me think that. Also grammer

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?

You receive 15% of the profit from a car wash how much money do you receive from a profit of 300

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?