Jammilviz
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what number decreased by 12 1/2% of itself gives 420?

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Riza1viz
[tex]unknown \ number: \ \ x\\\\12\frac{ 1}{2}\ \ \%\ \ x = 420\\\\\frac{25}{2}\cdot \frac{1}{100}x=420\\\\\frac{1}{8}x=420\ \ / \cdot 8 \\ \\x =3360[/tex]