The fruit shop shipped a batch of watermelons, and each basket of 9 or 7 was just finished. What is the minimum number of watermelons in this batch?
水果店运来一批西瓜，每筐9个或每筐7个都正好装完．这批西瓜最少有多少个？
<gadget id="calculator">9 * 7</gadget>
<output>63</output>

<result>63</result>