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12 - 10 = 2 orang
3 / 2,5 = 10+x / 10
30 = 25 + 2,5x
5 = 5/2 x
x = 2
tambahan pekerja = 2 orang
t1 = waktu 1
t2 = taktu 2
j1 = banyak pekerja 1
j2 = banyak pekerja 2