in a class of 50 students ,30 study biology and 25 study economics .15 study neither biology nor economics many take both subjects? many take only biology?
c.Ho many take economics only?

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  1. (50 - 15) study bio, eco, or both ... 35 students

    30 study bio , so (35 - 30) study only eco

    25 study eco , so (35 - 25) study only bio

    15 study only one subject , so (35 - 15) study both

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  2. Show The workings

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  3. How did you get 35?

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  4. I did not see the Venn diagram and the workings

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