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1kg ---------------------- S/.13 --------------------b
1kg ---------------------S/.15 ---------------------- 60
a + b = 60
18a + 13b = 15(60)
18a + 13b = 900
13(a+b)+5a = 900
13(60) + 5a = 900
5a= 120
a= 22
De 18 ------------ 22 kg
De 13 ---------------38 kg