# 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?

1. 👍 0
2. 👎 0
3. 👁 842
1. 7/10 + 7/20 = 21/20

So, 1/20 prefer both.

But how can someone prefer two days?

1. 👍 0
2. 👎 0
posted by Steve
p(wednesday|friday)=p(Fridayand Wednesday)/p(Friday)
7/20/7/10=1/2

1. 👍 2
2. 👎 0
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?

1. 👍 0
2. 👎 0
posted by tay
4. so i am in 11th grade and i am doing geometry and i need help with this question

1. 👍 1
2. 👎 0

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