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7/20 * 20 = 7
Sea x el numero buscado.
Y 28%= 28/100 = 7/25
1/2* 7/25 x = 7
7x/50 = 7
x= 50 *7/7
x=50
R: El número buscado es el 50.
35% de 20=700÷100=7. y no es la mitad del 28