There is a story book with illustrations on the first page, followed by illustrations every 5 pages, and what page is the 10th illustration on.
有一本故事书，第一页有插图，后面每隔5页都有一幅插图，第10幅插图在第多少页．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">9 * 6</gadget>
<output>54</output>

<gadget id="calculator">1 + 54</gadget>
<output>55</output>

<result>55</result>