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3+4=7
7:12990=
2C+5P= 13000 ( dikali 3)
3C+4P= 16000 ( dikali 2)
6C + 15P = 39000 (DIKURANGI)
6C + 8P = 32000 -
7P = 7000
P= 1000
Ambil salah satu persamaan
2C + 5P = 13000
2C + 5.1000 = 13000
2C + 5000 = 13000
2C = 13000-5000
2C = 8000
C= 4000
Ditanyakan:
1C + 2P = 1.4000 + 2.1000
= 4000 + 2000
= 6000