acim
Misal rata rata kelas B = x maka rata rata kelas A = x + 17. rata rata gabungan = 58 (40x + 45(x + 17)) / (40+45) = 58 (50x + 45x + 765) / 85 = 58 95x + 765 = 85(58) 95x + 765 = 4930 95x = 4930 - 765 95x = 4165 x = 4165/95 x = 43, 84 sehingga rata rata kelas A = x + 17 = 43,84 + 17 = 60, 84
rata rata gabungan = 58
(40x + 45(x + 17)) / (40+45) = 58
(50x + 45x + 765) / 85 = 58
95x + 765 = 85(58)
95x + 765 = 4930
95x = 4930 - 765
95x = 4165
x = 4165/95
x = 43, 84
sehingga rata rata kelas A = x + 17 = 43,84 + 17 = 60, 84