maths-urgently needed

90% of all students passed in Hindi, 85% in Maths and 150 students passed in both. calculate total number of students in the school.

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  1. N( A or B) = N(A) + N(B) - N(A and B)

    let the number of students be x

    100% x = 90%x + 85% x - 150
    x = .9x + .85x - 150
    - .75x = -150
    x = 200

    There are 200 students in the school

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  2. Is very good

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  3. 200

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    2. 👎
    3. ℹ️
    4. 🚩
  4. N( A or B) = N(A) + N(B) - N(A and B)

    let the number of students be x

    100% x = 90%x + 85% x - 150
    x = .9x + .85x - 150
    - .75x = -150
    x = 200

    There are 200 students in the school

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    2. 👎
    3. ℹ️
    4. 🚩

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