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Mathematics 12 Online
OpenStudy (anonymous):

I had this question on a test. Does it make any sense? In a school there are 20 teachers who teach math or physics. Of these, 21 teach math and 4 teach both. How many teach physics?

OpenStudy (anonymous):

It sounds incorrect but when u use this formula u get ans 3 |dw:1335505087146:dw|

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