Jawabanmu

2014-08-19T09:37:15+07:00
15 org -> 12 mgg
x -> 9 mgg
perbandingan berbalik nilai :
15/x = 9/12
x = 15 x 12 / 9
= 20 orang

tambhan pekerja = 20-15 = 5 orang
8 2 8
2014-08-19T09:51:09+07:00
15 pekerja = 12 minggu
x pekerja = 9 minggu
nilai x= ? 

 \frac{15}{x} =  \frac{9}{12} 
9x = 12.15 = 9x = 120 
x= 20
maka jumlah Pkja yg d tambah 20-15 = 5 pekerja
1 1 1