Math

7
10
of your friends prefer to take a math test on Friday.
7
20
prefer Friday and Wednesday. What fraction of those who prefer Friday also prefer Wednesday?

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asked by Cing
  1. 7/10 + 7/20 = 21/20

    So, 1/20 prefer both.

    But how can someone prefer two days?

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    posted by Steve
  2. answer is 1/2
    p(wednesday|friday)=p(Fridayand Wednesday)/p(Friday)
    7/20/7/10=1/2

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  3. 7
    10
    of your friends prefer to take a math test on Friday.
    7
    20
    prefer Friday and Wednesday. What fraction of those who prefer Friday also prefer Wednesday?

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    2. 👎 0
    posted by tay
  4. so i am in 11th grade and i am doing geometry and i need help with this question

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