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celana = C
3 baju = 1 celana =====>> 3B = C
4 baju dan 3 celana = 65.000 =====> 4B + 3C = 65.000
subsitusikan nilai 3B = C
4B + 3C = 65.000
4B + 3(3B) = 65.000
4B + 9B = 65.000
13B = 65.000
B = 65.000 : 13
B = 5.000
harga sepotong baju adalah 5.000
ingat harga 3 baju sama dengan 1 celana
C = 3b
= 3(5.000)
= 15.000
Jadi harga sepotong celana adalah 15.000
jawab : B. 15.000
4b + 3c = 65.000
4b + 3(3b) = 65.000
4b + 9b = 65.000
13b = 65.000
b = 65.000 : 13
b = 5.000
c = 3b
= 3 × 5.000
= Rp 15.000