Penjelasan dengan langkah-langkah:
S T A T I S T I K A
L × 72 + 12 × 80 = (L + 12) × 75
72L + 960 = 75L + 900
(75 – 72)L = 960 – 900
3L = 60
L = 60
3
L = 20
Jadi, banyak siswa laki-laki adalah 20 siswa
misal banyak siswa laki-laki = x
75 = 72x + (12 × 80)/(12 + x)
75 = 72x + 960/(12 + x)
75(12 + x) = 72x + 960
900 + 75x = 72x + 960
75x - 72x = 960 - 900
3x = 60
x = 60/3
x = 20
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Penjelasan dengan langkah-langkah:
S T A T I S T I K A
L × 72 + 12 × 80 = (L + 12) × 75
72L + 960 = 75L + 900
(75 – 72)L = 960 – 900
3L = 60
L = 60
3
L = 20
Jadi, banyak siswa laki-laki adalah 20 siswa
misal banyak siswa laki-laki = x
75 = 72x + (12 × 80)/(12 + x)
75 = 72x + 960/(12 + x)
75(12 + x) = 72x + 960
900 + 75x = 72x + 960
75x - 72x = 960 - 900
3x = 60
x = 60/3
x = 20