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29 October, 01:56

In a classroom the probabilty that the teacher chooses a boy from a girl is 0.45. how many boys are there?

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  1. 29 October, 03:34
    0
    P=favorable outcome/total outcome

    P of choosing boy is given which 0.45

    0.45=B/20

    B=9 boys
  2. 29 October, 04:21
    0
    0.45/1 becuase 1 is 100%

    0.45/1=4.5/10=45/100=9/20

    9/20 chance that chooses a boy

    20 people

    9/20 times 20=9

    9 boys
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