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4kg----6euros
12kg---x
(4)(x)=(12)(6)
4x=72
x=72/4
x=18
6kg cuestan 18 euros
4kg---6euros
20kg--x
(4)(x)=(20)(6)
4x=120
x=120/4
x=30
y 20 kg cuestan 30 euros
Espero y te sirva!!!!