In a mixture of 162 liters, the ratio of juice to water is 7 : 2. If (z + 12) liters of mixture is taken out and replaced with 15 liters of water, then the ratio of juice to water in the resultant mixture becomes 7 : 3. Find the value of �" id="MathJax-Element-75-Frame" role="presentation" style="position: relative;" tabindex="0">��" id="MathJax-Element-130-Frame" role="presentation" style="position: relative;" tabindex="0">�$�$ $�$ $�$ z.2�+15" id="MathJax-Element-76-Frame" role="presentation" style="position: relative;" tabindex="0">2�+152�+15" id="MathJax-Element-131-Frame" role="presentation" style="position: relative;" tabindex="0">2�+15$2�+15$ $2�+15$ $2�+15$