72 = ((75 x a) + (70 x b)) / (a + b)
72 = (75a + (70 x (6 + a)) / (a + (6 + a))
72 = (75a + 420 + 70a) / 2a + 6
144a + 432 = 145a + 420
a = 12
b = 6 + a
= 6 + 12
= 18
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Minggu, 19 Mei 2024 -
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72 = ((75 x a) + (70 x b)) / (a + b)
72 = (75a + (70 x (6 + a)) / (a + (6 + a))
72 = (75a + 420 + 70a) / 2a + 6
144a + 432 = 145a + 420
a = 12
b = 6 + a
= 6 + 12
= 18
Editor: Yulia Pramuninggar
Sumber: Buku Matematika Kelas 8 Semester 2
