Nilai rata2 mm dlm suatu kls 72, sedangkan nilai rata2 siswa pria 69 dan nilai rata2 siswa wanita 74. jika bnyk siswa dlm kls 40 org, bnyk siswa pria adalah....
subebe
X = pria 72 x 40 = (40-x) 74 + 69x 2880 = 2960 - 74x + 69x 2880 = 2960 - 5x 5x = 80 x = 16 pria = 16 wanita = 24
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tiarasukma17
Jumlah nilai seluruhnya = 72 x 40 = 2880 x = pria y = wanita x + y = 40 y = 40 - x
72 x 40 = (40-x) 74 + 69x
2880 = 2960 - 74x + 69x
2880 = 2960 - 5x
5x = 80
x = 16
pria = 16 wanita = 24
x = pria
y = wanita
x + y = 40
y = 40 - x
69x + 74y = 2880
69x + 74(40 - x) = 2880
69x + 2960 - 74x = 2880
69x - 74x = 2880 - 2960
-5x = -80
x = -80 : -5
x = 16
jadi, banyak siswa pria yaitu 16 orang