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p = panas, d = dingn, c = campuran
mp = __ ? tp = 100 ºC
md = 6 kg td = 20 ºC
tc = 52 ºC
tc = (mp × tp + md × td) / (mp + md)
52 = (mp × 100 + 6 × 20) / (mp + 6)
52 = (100 mp × 100 + 120) / (mp + 6) kali silang
100 mp + 120 = 52 mp + 312
48 mp = 192
mp = 192/48 = 4 kg
Ok ?