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Given that the number of U.S. 10th graders who were alcohol-free was 50% more than the number who had used alcohol, find the missing data. $$\begin{array} { | l | l | l | l | } \hline & \text { Used Alcohol } & \text { Alcohol-Free } & \text { Totals } \\\hline \text { U.S. } & x & y & 13,750 \\\hline \text { Europe } & z & w & 95,300 \\\hline \text { Totals } & 63,450 & 45,600 & \\\hline\end{array}$$

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