Jessica is building a playhouse. she uses 3 sheets of drywall and 73 nails. the ratio of nails to sheets to drywall, in simplest form, is : because she uses nail(s) for sheet(s) of drywall

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?