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One member of the debate team is going to be chosen President. Each member is equally likely to be chosen. The probability that a girl is chosen is 2/3 the probability that a boy is chosen. If the debate team has 20 people, how many girls are there?

 Jul 27, 2020
 #1
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b+g =20        or   b = 20-g

 

and    g = 2/3b      sub in the definition of b above

          g = 2/3 (20-g)

          g = 40/3 - 2/3 g

         5/3 g = 40/3

           5 g = 40

               g = 8

 Jul 27, 2020
 #2
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thanks!

 Jul 27, 2020

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