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9 minggu ----> y pekerja
perbandingan berbalik nilai, kalikan lurus
9y=12×15
y=180/9
y=20 pekerja
pekerja yg harus di tambah = 20-15=5 pekerja
12 ---> 15
9 ---> x
12:9=XX15
X9=15X12
X9=180
X=180:9
X=20
jadi,banyak pekerja adalah 20-15=5