A136 students are in the cafeteria. the ratio of students buying lunch to those who brought their lunch is 3: 10. how many students brought their lunch?

approximately 95 because 3/10=41/136  and 139-41 is 95

10/13= .769

3/13= .23

136X.77=104.72   105

136X.23=31.23       31

105 Students brought their lunch

y > 1/3x

y < = -x + 4

hope this : )