Xiaopang selected some stamps and put them in the new stamp album to participate in the exhibition. If each page contains 9 stamps, after filling 8 pages, there are still 78 stamps left. How many stamps did Xiaopang choose to participate in the exhibition this time? Activity?
小胖挑选了一些邮票放在新的集邮簿中参加展示活动，如果每页装9张邮票，装满8页后，还剩下78张邮票，这次小胖共选出多少张邮票参加展示活动？
<gadget id="calculator">9 * 8</gadget>
<output>72</output>

<gadget id="calculator">72 + 78</gadget>
<output>150</output>

<result>150</result>