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13=16
8=23
23-16 = 7 orang
(20)(16) = (7)(16) + (5)(0) + ((20-(7+5))(16+x))
320 = 112 + 0 + (20 - 12)(16 + x)
320 = 112 + (8)(16 + x)
320 = 112 + 128 + 8x
320 = 240 + 8x
8x = 320 - 240
8x = 80
x = 80 / 8
x = 10
Jadi jumlah pekerja tambahan yang dibutuhkan adalah 10 orang