Jawabanmu

2014-05-07T19:45:14+07:00
nilai=72x40=2880
x= pria, y=wanita
69x + 74y = 2880
x+y=40
y=40-x

pake substitusi
69x+74y=2880
69x+74(40-x)=2880
69x+2960-74x=2880
-5x=-80
x=16 siswa