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21 April, 10:07

1/6 of the girls and 2/7 of the boys in a school marching band are in the percussion section. The percussion section has 6 girls and 10 boys. How many students are in the marching band?

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  1. 21 April, 10:18
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    Let G be the number of girls and B be the number of boys in the band all together. 1/6 of all the girls is 6 girls so (1/6) G = 6 or G = 6·6 = 36 2/7 of all the boys is 10 boys so (2/7) B = 10 or B = (7/2) ·10 = 7·5 = 35 So the band has 36 girls and 35 boys and that equals 71 students
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