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12 dogs decreased by 25%

Sagot :

[tex]100\%-20\%=75\%\\\\\begin{array}{ccc}100\%&-&12\\\\75\%&-&x\end{array}\ \ \ \ |cross\ multiply\\\\\\100x=12\cdot75\ \ \ \ |divide\ btoh\ sides\ by\ 100\\\\x=\frac{900}{100}\\\\\boxed{x=9}\leftarrow answer[/tex]
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