Two fifths of the seventh graders at a school are going on a trip with 40 chaperones. A total of 320 people are going on the trip. What equation could use to see how many seventh graders attend m.s.?

Answer 1

2g/5 + 40 = 320

2g/5 = 280

g/5 = 140

g = 5(140) = 700 7th graders are going

check the answer:

2/5 of 700 = 2(140) = 280, add 40 = 320