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45-9 = 36
28×45 = X × 36
X = 28×45 / 36
X = 35
maka
35 - 28 = 7
jadi pekerja ditambah 7 orang
semoga berguna +_+
---- -----
x 45
36x = 28 x 45
36x = 1260
x = 35 pekerja
yg harus ditambahkan = 35-28 = 7 pekerja