Question

12 dogs decreased by 25%

Answer 1

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