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El resto es 1/4
1/5 del resto → biología
El resto del resto son 4/5 y es igual a los 20 libros de historia.
Entonces:
4/5*1/4 * Total = 20
Total = 100 libros
Medicina = 3/4 * 100 = 75 libros
Biología = 100 - 75 - 20 = 5 libros