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n1 = 10
rata-rata2 = x ---> ditanyakan
n2 = 5
rata-rata gabungan r3 = 160
r3 = (r1*n1 + x*n2)/(n1 + n2)
160 = (162 * 10 + x * 5) / (10 + 5)
160 = (1620 + 5x)/15
2400 = 1620 + 5x
5x = 780
x = 156