shasadou wrote:
A mixture of oil, water, and vinegar contains 10% oil. After all of the water evaporates, what percent of the mixture is oil?
(1) Before the water evaporated, the mixture exactly filled a one liter bottle.
(2) Before the water evaporated, vinegar accounted for forty percent of the mixture.
\( {\text{Before: x}}\,\,{\text{liters}}\,\,\,\,\left\{ \begin{gathered}
{\text{oil}}\,\,:0.1x\,\,{\text{liters}} \hfill \\
water\,\,:\,\,k\left( {0.9x} \right)\,\,{\text{liters}} \hfill \\
vinegar\,\,:\,\,\,\left(\)
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