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Initially, 40% of the students at the school dance are freshmen. Then, 15 more freshmen arrive, after which 50% of the students at the dance are freshmen. How many students are now at the dance after the additional freshmen arrive?

 Sep 16, 2021
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x = initial amount of people at the dance and

      Initially    .40 x = freshmeno 

   then add 15 freshmen

.50 (x+15) = freshmeno + 15

 .50(x+15 ) = .40x + 15

  .5x + 7.5 = .40x + 15

   .1x = 7.5

      x = 75    people at the dance initially .....        after 15 more freshmen arrive there is 90 people at the dance

 Sep 16, 2021

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