Question

five hundred students attended the valentine's dance at central middle school. of the students, 30% were 6th graders, 42% were 7th graders and the rest were 8th graders. how many 8th graders attended the Valentine's dance?

Answer 1

Total students: 500

6th graders: 500*30% = 150

7th graders: 500*42% = 210

8th graders: 500 - 150 - 210 = 140