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a(2)-1 = 3
2a-1 = 3
2a = 3+1
2a = 4
a =4/2
a= 2
x+2y =b
2+2(1) = b
2+2= 4
Jadi a=2, b= 4
12. Misal. bnyak karyawan pria = x
3juta(x)+2,5juta(30-x) / 30 = 2,7 juta(30)
3 juta x - 2,5 jutax-75 juta = 81 juta
0,5 juta x = 81-75 juta
0,5 juta x = 6 juta
x = 6/0,5
x = 12 orang <----- jawabn
14. Selisih tabungan awal
= 100000-80000
= 20000
Selisih kenaikan
= 1500-1000
= 500
Tabungan mereka akan sama pada saat
= 20000/500
= 40