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September 17, 2014

September 17, 2014

Posted by **stacey** on Thursday, November 10, 2011 at 6:57pm.

- math -
**Steve**, Thursday, November 10, 2011 at 7:24pmIf you count all the students with computers, and then count all those with cassettes, you count twice the ones that have both. So, adjust the total accordingly.

30 students. 4 with nothing, leaves 26 with either computer or cassette or both

17+20 = 37, but there are only 26 students available, so there must be 37-26=11 with both. Just adding up the numbers counted 11 of them twice.

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