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x = 25 hari
15/25 = x/30
x = 25 x 30 : 15
= 750 : 15
= 50 orang
50 - 30 = 20 orang
25-> 30
25x=15.30
25x=450
x=450/25
x=18
jumlah orang yg harus ditambah adalah 18-15=3 orang