The bookstore newly purchased 7 sets of "Romance of the Three Kingdoms" for a total of 525 yuan. Each set of "Romance of the Three Kingdoms" has 3 copies. What is the average price of each copy?
书店新购进7套《三国演义》，共用去525元，每套《三国演义》有3本，平均每本的价钱是多少元？
<gadget id="calculator">525 / 7 / 3</gadget>
<output>25</output>

<result>25</result>