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x% failed in subject 1, y% in subject 2, z% in both: percentage passing both

The same question, asked 3 times: CDS 2 2017*, CDS 2 2018*, CDS 2 2019. Every wording below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    CDS 2 2017

    33
    In an examination, 35% students failed in Hindi, 45% students failed in English and 20% students failed in both the subjects. What is the percentage of students passing in both the subjects ?

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  2. Question 2

    CDS 2 2018

    27
    In an examination, 50% of the candidates failed in English, 40% failed in Hindi and 15% failed in both the subjects. The percentage of candidates who passed in both English and Hindi is

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  3. Question 3

    CDS 2 2019

    42
    In an examination, 52% candidates failed in English and 42% failed in Mathematics. If 17% failed in both the subjects, then what percent passed in both the subjects ?

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