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The ratio of the number of Grade 6 students to the number of Grade 7 students to the number of Grade 8 students in a school is 3 : 3.4 : 3.2 . If the school has 480 students in these grades, how many are in Grade 8?

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sqdancefan

Answer:

  160

Step-by-step explanation:

The fraction of students in grade 8 is ...

  (grade 8 students)/(total students in all grades)

  = 3.2/(3 +3.4 +3.2) = 3.2/9.6 = 1/3

Then the number of students in grade 8 is ...

  (1/3)(480 students) = 160 students . . . in grade 8

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