Xiaoli bought a new photo album. Put the photos of her National Day trip into a new photo album. If each page contains 3 photos, there will be 3 empty pages; if each page contains 5 photos, there will be 9 empty pages. How many photos did she take on National Day?
小丽买一本新像册．把她国庆节游玩照的相片装入新像册，若每页装3张，还空3页；若每页装5张，还空9页．她国庆节照了多少张照片．
<gadget id="calculator">36 / 2</gadget>
<output>18</output>

<gadget id="calculator">18 - 3</gadget>
<output>15</output>

<gadget id="calculator">15 * 3</gadget>
<output>45</output>

<result>45</result>