Melissa needs to mix 2 cups of baking soda with 3 cups of vinegar to make a clean solution how many cups of baking soda are needed for each cup of vinegar

Out of the 150 students at a summer camp, 72 signed up for canoeing. there were 23 students who signed up for trekking, and 13 of those students also signed up for canoeing. use a two-way table to organize the information and answer the following question: approximately what percentage of students signed up for neither canoeing nor trekking?