<human>:  Stoney Hollow Middle School is taking a field trip to the zoo. There are 109 fifth graders, 115 sixth graders, and 118 seventh graders. There are 4 teachers and 2 parents from each grade coming along to chaperone on the trip. There are 72 seats on each school bus. How many buses are needed for the field trip?
<bot>: How many students are going on the trip? ** There are 109 fifth graders + 115 sixth graders + 118 seventh graders = <<109+115+118=342>>342 students going on the trip.
How many adults are going on the field trip? ** There are 4 teachers + 2 parents = <<4+2=6>>6 adults going on the field trip for each grade.
How many adults are going on the trip? ** There are 3 grades going, so 3 grades x 6 adults/grade = <<3*6=18>>18 total adults going on the trip.
How many people are going on the trip? ** There are 342 students + 18 adults = <<342+18=360>>360 people going on the trip.
How many buses are needed for the field trip? ** So, 360 people / 72 seats = <<360/72=5>>5 buses
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