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Y = Peso de los libros
X + Y = 44
Pero: X/Y = 1/10
Osea que Y = 10X
Reemplazo el valor de Y
X + 10X = 44
11X = 44
X = 44/11
X = 4 Kg
La repisa pesa 4 Kg y los libros: 10(4) = 40 Kg