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22 January, 15:12

Mario makes 6 free throw shots out of his first 10 attempts. what is the least number of consecutive shots mario must make to increase his percentage from 60% to at least 70%?

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  1. 22 January, 15:22
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    Mario made 6 free throw shots out of 10 attempts which means that his accuracy is

    6/10 = 0.6 = 60%

    To increase it from 60% to 70%

    We let x as the number of consecutive shots Mario must make

    (6 + x) / (10 + x) = 0.70

    Solving for x

    6 + x = 7 + 0.70x

    x - 0.70x = 7 - 6

    0.30x = 1

    0.30x/0.30 = 1/0.30

    x = 3.33 ~ 4

    He must make at least 4 shots
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