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10 hari = x
x = 14×15 / 10
= 210/10
= 21 orang
2 minggu = 14 hari
pekerja yang di perlukan jika 10 hari dimisalkan dengan x
15 : x = 10 : 14
210 = 10x
x = 21
jadi pekerja tambahan yang dibutukan 21-15 = 6 orang