The measures of two supplementary angles are in of ratio of 2: 3. find the two angles

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Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form

The number of 8th graders who responded to a poll of 6th grade and 8 th graders was one fourtg of the number of 6th graders whi responded if a total of 100 students responddd to the poll how many of the students responded were 6 th graders