The monthly profit collects 20 stamps, and the stamps collected by Yan Chao are three times the monthly profit. Gui Xiang collects 15 fewer cards than Yan Chao. How many cards does Guixiang collect?
月利收集20张邮票，燕超收集的邮票是月利的3倍．桂香比燕超少收集15张．桂香收集多少张？
<gadget id="calculator">20 * 3</gadget>
<output>60</output>

<gadget id="calculator">60 - 15</gadget>
<output>45</output>

<result>45</result>