math

in a class of 50 students ,30 study biology and 25 study economics .15 study neither biology nor economics
a.how many take both subjects?
b.how 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. 👎
  2. Show The workings

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    2. 👎
  3. How did you get 35?

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    2. 👎
  4. I did not see the Venn diagram and the workings

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