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X/3 = Discos de Beethoven
X - X/3 = 2X/3
Quedan 2X/3
(2X/3)(2/5) = 4X/15
4X/15 = Discos de Bach
Quedan 2X/3 - 4X/15 = 10X/15 - 4X/15 = 6X/15 = 2X/5
2X/5 = 42
2X = 42x5
2X = 210
X = 105
En total tienes 105 discos
de Beethoven: (105)(1/3) = 35
Quedan 105 - 35 = 70
70(2/5) = 28
de Bach 28 discos
Mozart 42
35 + 28 + 42 = 105