Puedes calcular con una regla de tres
Numero : x
x--------------100%
x-280--------30%
x-280=30x/100
x-280 = 0.3x
x-0.3x = 280
0.7x=280
X=280/0.7
X=400
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Puedes calcular con una regla de tres
Numero : x
x--------------100%
x-280--------30%
x-280=30x/100
x-280 = 0.3x
x-0.3x = 280
0.7x=280
X=280/0.7
X=400