△○○○△○○○…△○○○△If there are 10 △ in the picture above, how many ○ in total?
△○○○△○○○…△○○○△如果上图中一共有10个△，那么一共有多少个○．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">3 * 9</gadget>
<output>27</output>

<result>27</result>