3T+8C=39.70 multiplicamos por 5 a todo
5T+6C=47.10 multiplicamos por 3 a todo
entonces
15T+40C = 198.5
15T+18C= 141.3 restamos
---------------------
22C = 57.2
C=2.60
5T+8(2.60)=39.70
5T+20.80=39.70
5T=18.90
T=3.78
cafe 2.60 te 3.78 espero que te ayude
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3T+8C=39.70 multiplicamos por 5 a todo
5T+6C=47.10 multiplicamos por 3 a todo
entonces
15T+40C = 198.5
15T+18C= 141.3 restamos
---------------------
22C = 57.2
C=2.60
5T+8(2.60)=39.70
5T+20.80=39.70
5T=18.90
T=3.78
cafe 2.60 te 3.78 espero que te ayude