Tuesday

January 27, 2015

January 27, 2015

Posted by **Anonymous** on Wednesday, February 20, 2013 at 8:38am.

- maths-urgently needed -
**Reiny**, Wednesday, February 20, 2013 at 10:13amN( A or B) = N(A) + N(B) - N(A and B)

let the number of students be x

100% x = 90%x + 85% x - 150

x = .9x + .85x - 150

- .75x = -150

x = 200

There are 200 students in the school

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