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Alicia=2Juan (II)
Ana=3Alicia (III)
(III) EN (I)
Alicia+3Alicia+juan=72
4alicia+juan=72 (IV)
(II)EN(IV)
4(2juan)+juan=72
9juan=72
juan = 72/9
Juan= 8€
(II) 》Alicia=2Juan
alicia = 2(8)
alicia= 16
(III)》 ana=3alicia
ana=3×16
ana=48